CN103684361A - Laser pulse differentiating circuit and driving method thereof - Google Patents
Laser pulse differentiating circuit and driving method thereof Download PDFInfo
- Publication number
- CN103684361A CN103684361A CN201210322200.XA CN201210322200A CN103684361A CN 103684361 A CN103684361 A CN 103684361A CN 201210322200 A CN201210322200 A CN 201210322200A CN 103684361 A CN103684361 A CN 103684361A
- Authority
- CN
- China
- Prior art keywords
- differential circuit
- laser pulse
- laser
- resistance
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a laser pulse differentiating circuit and a driving method thereof. The laser pulse differentiating circuit comprises a square wave module for generating square wave signals, a differentiating circuit connected with the square wave module for changing the pulses of the square wave signals, and a laser pulse module connected with the differentiating circuit for generating laser pulses. The technical scheme provided by the invention applies limited costs to increase the width of laser emitting pulses, and realizes the tuning of laser pulse power and pulse width.
Description
Technical field
The present invention relates to laser pulse technical field, particularly a kind of laser pulse differential circuit and driving method thereof.
Background technology
In current most industry field, all need to relate to range finding, survey high work, such as the application in the fields such as military civil engineering, navigation, golf, hunting.
Pulsed laser ranging method, due to advantages such as the angle of divergence of laser are little, and laser pulse duration is short, and instantaneous power is large, and ranging is far away, and antijamming capability is strong, good concealment, was especially widely used in military field in recent years.And effective combination of burst pulse string and phase ranging method makes the application of this method in closely finding range more extensive.
Along with the development of technology, the required precision of paired pulses laser ranging, also progressively improves.Because the precision of pulsed laser ranging is subject to the impact of pulsewidth larger, and the cost of pulsed laser ranging is always very high, therefore how to apply the width that limited one-tenth improved Laser emission pulse originally, and how to realize tunable to laser pulse power and pulse duration, become one of current problem demanding prompt solution.
Summary of the invention
Technical scheme of the present invention is applied the width that limited one-tenth improved Laser emission pulse originally, and has realized tunable to laser pulse power and pulse duration.
For solving the problems of the technologies described above, technical scheme of the present invention provides a kind of laser pulse differential circuit, comprising:
Square wave module, in order to produce square-wave signal;
The differential circuit being connected with described square wave module, in order to change the pulse of described square-wave signal;
The laser pulse module being connected with described differential circuit, in order to produce laser pulse.
Optionally, described square wave module comprises one or more the combination in single-chip microcomputer, CPLD, FPGA and DDS.
Optionally, described differential circuit is RC differential circuit, and described RC differential circuit becomes spike by the rectangular pulse of described square-wave signal.
Optionally, described laser pulse module comprises triode and the laser tube being connected with described triode.
Optionally, described triode is high-frequency triode.
For solving the problems of the technologies described above, technical scheme of the present invention also provides a kind of driving method of laser pulse differential circuit, comprising:
Electric capacity based in described differential circuit and/or the variation of resistance, become spike by the rectangular pulse of square-wave signal;
Pulsewidth based on described spike, controls described laser pulse module and results from the laser that described pulsewidth matches.
Optionally, the variation of the electric capacity in described differential circuit and/or resistance refers to that the capacitance of controlling the electric capacity in described differential circuit changes according to first threshold and/or the resistance of controlling the resistance in described differential circuit changes according to Second Threshold.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the drive circuit that provides of the embodiment of the present invention;
Fig. 2 is the block diagram of the laser pulse differential circuit that provides of the embodiment of the present invention;
Fig. 3 is the flow chart of the driving method of the laser pulse differential circuit that provides of the embodiment of the present invention;
Fig. 4 is the circuit diagram of the differential circuit that provides of the embodiment of the present invention;
Fig. 5 is the oscillogram of the square wave that provides of the embodiment of the present invention after differential circuit;
Fig. 6 is that in the laser pulse differential circuit that provides of the embodiment of the present invention, voltage variation capacitance is got a circuit diagram of reverse biased;
Fig. 7 is that in the laser pulse differential circuit that provides of the embodiment of the present invention, voltage variation capacitance is got another circuit diagram of reverse biased;
Fig. 8 is the oscillogram after Fig. 6 and Fig. 7 laser pulse differential circuit;
Fig. 9 is provided in the laser pulse differential circuit that provides of the embodiment of the present invention by one circuit diagram of differential resistance;
Figure 10 is provided in the laser pulse differential circuit that provides of the embodiment of the present invention by another circuit diagram of differential resistance;
Figure 11 is the oscillogram after Fig. 9 and Figure 10 laser pulse differential circuit.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that.Therefore the present invention is not subject to the restriction of following public embodiment.
Basic laser burst pulse drive circuit: produce and there is the square-wave signal of a certain frequency period by clock generator, and using this as driving signal, control laser tube and produce laser.Fig. 1 is the circuit diagram of the drive circuit that provides of the embodiment of the present invention, below in conjunction with Fig. 1, describes in detail.
When square wave is in low level during the half period, transistor is in cut-off (critical snowslide) state, and transistor collector and emitter, in off state, now do not have electric current to flow through LD (laser diode, laser diode), and LD is not luminous.When square wave rising edge arrives, and reach the conducting voltage of triode emitter junction PN junction, now, transistor (snowslide) collector electrode and emitter are opened rapidly, and electric current is through LD to ground, and LD is luminous, produces thus laser pulse signal.Otherwise when square-wave signal trailing edge arrives, lower than triode emitter junction PN junction conducting voltage, transistor will enter off state again, by the current cut-off of LD, LD stops luminous; Visible, in the time period setting high at square-wave signal, laser will keep continuing luminance, until square wave trailing edge is when arrive.So repeatedly, just can obtain the laser pulse string that same square wave frequency period is identical.Laser emission power and pulsewidth mainly will be subject to the impact (pulsewidth is exactly duty ratio divided by the cycle) of square wave pulse width herein, the square-wave signal slightly low for frequency and duty ratio is 50%, good laser burst pulse will be difficult to obtain, the cut-off frequency of triode has also played very important impact for the pulse duration of Laser emission simultaneously, in the present invention, giving tacit consent to triode cut-off frequency can meet the demands, and emphatically the application of adjustable differential circuit is set forth.
Fig. 2 is the block diagram of the laser pulse differential circuit that provides of the embodiment of the present invention, below in conjunction with Fig. 2, describes in detail.
Described laser pulse differential circuit, comprising:
The differential circuit 2 being connected with described square wave module 1, in order to change the pulse of described square-wave signal;
The laser pulse module 3 being connected with described differential circuit 2, in order to produce laser pulse.
Described square wave module 1 comprises one or more the combination in single-chip microcomputer, CPLD, FPGA and DDS.Described differential circuit 2 is RC differential circuit, and described RC differential circuit becomes spike by the rectangular pulse of described square-wave signal.Described laser pulse module 3 comprises triode and the laser tube being connected with described triode.Described triode is high-frequency triode.
Fig. 3 is the flow chart of the driving method of the laser pulse differential circuit that provides of the embodiment of the present invention, below in conjunction with Fig. 3, describes in detail.
Step S1, the electric capacity based in described differential circuit and/or the variation of resistance, change the pulsewidth of spike, and described spike is obtained after by described differential circuit by the rectangular pulse of square-wave signal;
Step S2, the pulsewidth based on described spike, controls described laser pulse module and results from the laser that described pulsewidth matches.
In described step S1, the rectangular pulse of square-wave signal, by after described differential circuit, becomes spike from rectangular pulse, the pulsewidth that can change described spike by changing electric capacity in described differential circuit and/or resistance.
In described step S2, the pulsewidth of spike affects the transmitting power of laser, and the change of the pulsewidth of spike can be controlled described laser pulse module and result from the laser that described pulsewidth matches.
Electric capacity in described differential circuit and/or the variation of resistance refer to that the capacitance of controlling the electric capacity in described differential circuit changes according to first threshold and/or the resistance of controlling the resistance in described differential circuit changes according to Second Threshold.The product of described first threshold and described Second Threshold can not equal one.
Technical scheme of the present invention is introduced variable differential circuit method, and known in impulse circuit, and conventional RC differential circuit is transformed to spike rectangular pulse, as triggering signal.Fig. 4 is the circuit diagram of the differential circuit that provides of the embodiment of the present invention, as shown in Figure 4:
In described differential circuit, positive pulse rising edge process, square-wave signal charges to C by R;
Circuit responce:
Formula one;
Positive pulse trailing edge process, capacitor C is through resistance R electric discharge;
Circuit responce:
Formula two;
τ=RC is the time constant of circuit, and it determines the speed of charge and discharge process.
The circuit of Fig. 4 of take is example, if square wave amplitude is 4V, the cycle is T=10ns, and duty ratio is 50%, in differential circuit, gets C=5pF, R=50 Ω, and, after differential circuit shown in Fig. 3, square wave half-wave pulsewidth is lower than 0.5ns, and concrete waveform is shown in Fig. 5.
In differential circuit (shown in Fig. 3),
formula three, circuit parameter need meet τ ≈ RC < < t
p(square wave pulse width).
Technical scheme application of differential circuit of the present invention can be larger shortening triode be opened into time interval (same laser pulse width) of shutoff, simultaneously, for the controlled electric capacity of capacity and the controlled resistance of resistance, can realize controlled to laser pulse width and luminous power.In formula three, u
rto mainly be subject to τ ≈ RC with
impact, after square-wave signal is chosen, its rise time and fall time also will be fixed, so can be by
be considered as fixterm, and u now
raffected by timeconstantτ ≈ RC.That is to say, change resistance R and/or capacitor C and can change u
r, u
rbe subject to the impact of resistance R and/or capacitor C.
With Fig. 6 and Fig. 7, illustrate below.As shown in Figure 6 and Figure 7, u
rbe subject to the impact of resistance R and/or capacitor C, when the resistance of resistance R is fixedly time, the voltage variation capacitance that employing capacity is controlled, changes the capacitance of capacitor C, and laser pulse width and luminous power change the volume change with voltage variation capacitance.
In Fig. 6, D2 is voltage variation capacitance (also referred to as variable capacitance diode), now voltage variation capacitance adds reverse biased 1Vdc, D3 is low running current laser tube, with current waveform, represent its luminous power and pulsewidth, V1 is square-wave signal, and side is 10ns wave period, the pulsewidth of square wave is 5ns, and the amplitude of square wave is 4V; D2 is variable capacitance diode, can change according to its reverse voltage of change the size of its capacitance; Q1 is radio frequency triode, selects BFG540 herein, f
t=9GHz; D3 is laser tube; L1, L2 are inductance, and effect (described effect refers to the effect of inductance L 1, L2) herein presents high impedance to square-wave signal, and direct current signal is to low-resistance; As Fig. 6: by changing the size of V2 value, formed the transfiguration loop of variable capacitance diode D2 between voltage V2, inductance L 1, voltage variation capacitance D2, resistance R 3, inductance L 2; Timeconstantτ=RC=R2 (D2 ∥ C1), the capacitance of capacitor C 1 is fixed, and the resistance of resistance R 2 is fixed, change the size of voltage V2, can change the capacitance of variable capacitance diode D2, thereby change in timeconstantτ=RC, the capacitance of capacitor C, thus laser pulse width and luminous power changed.
In like manner, in Fig. 7, D2 is voltage variation capacitance, and now voltage variation capacitance adds reverse biased 4Vdc, and D1 is low running current laser tube, with current waveform, represents its luminous power and pulsewidth.V1 is square-wave signal, and D2 is variable capacitance diode, can change according to its reverse voltage of change the size of its capacitance; Q1 is radio frequency triode, and D1 is laser tube; L1, L2 are inductance, by changing the size of V2 value, have formed the transfiguration loop of variable capacitance diode D2 between voltage V2, inductance L 1, voltage variation capacitance D2, resistance R 3, inductance L 2; Timeconstantτ=RC=R2 (D2 ∥ C1), the capacitance of capacitor C 1 is fixed, and the resistance of resistance R 2 is fixed, change the size of voltage V2, can change the capacitance of variable capacitance diode D2, thereby change in timeconstantτ=RC, the capacitance of capacitor C, thus laser pulse width and luminous power changed.
As Fig. 6 and Fig. 7, by changing capacitor C in variable differential circuit, can make the size of laser current and pulse duration obtain larger change, realized thus the adjustable of laser pulse width and power.
As shown in Figure 8, by the change of electric capacity in variable differential circuit, the size of laser current and pulse duration can obtain larger change, have realized thus the adjustable of laser pulse width and power.
Fig. 9 is that a circuit diagram of differential resistance, Figure 10 are provided in the laser pulse differential circuit that provides of the embodiment of the present invention is that another circuit diagram of differential resistance is provided in the laser pulse differential circuit that provides of the embodiment of the present invention.With Fig. 9 and Figure 10, illustrate below.Specific embodiment is as follows: when capacitor C is fixedly time, select the resistance of different resistances for circuit, laser pulse width and luminous power change the resistance with selected resistance.As shown in Figure 9, by TTL low and high level, control to select the value of resistance R in differential circuit.Resistance R 3 end Transistor-Transistor Logic levels set low, and resistance R 4 end Transistor-Transistor Logic levels set high, and R=R2=0.06K, represents its luminous power and pulsewidth with electric current I (Q1:C) waveform.As shown in figure 10, by TTL low and high level, control to select the value of resistance R in differential circuit.Resistance R 3 end Transistor-Transistor Logic levels set high, and resistance R 4 end Transistor-Transistor Logic levels set low, and R=R1=0.005K, represents its luminous power and pulsewidth with electric current I (Q6:C) waveform.
As shown in figure 11, by the change of resistance R in variable differential circuit, the size of laser current and pulse duration can obtain larger change, have realized thus the adjustable of laser pulse width and power.
To sum up show, just by controlled differential circuit, realized controlled to Laser emission pulsewidth and luminous power; This method is comparatively simple and reliable and stable.
Technical scheme of the present invention at least has following advantage:
The complexity producing for laser burst pulse in the past, and for the laser pulse in different frequency cycle, often there is the difference of laser power and pulsewidth, this will strengthen its amplitude phase error, and solution often adopts the comparatively feedback loop of complexity.Circuit structure is proposed simple herein, dependable performance, the circuit implementing method that laser pulse power and pulsewidth are adjustable.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible change and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection range of technical solution of the present invention.
Claims (7)
1. a laser pulse differential circuit, is characterized in that, comprising:
Square wave module, in order to produce square-wave signal;
The differential circuit being connected with described square wave module, in order to change the pulse of described square-wave signal;
The laser pulse module being connected with described differential circuit, in order to produce laser pulse.
2. laser pulse differential circuit as claimed in claim 1, is characterized in that, described square wave module comprises one or more the combination in single-chip microcomputer, CPLD, FPGA and DDS.
3. laser pulse differential circuit as claimed in claim 1, is characterized in that, described differential circuit is RC differential circuit, and described RC differential circuit becomes spike by the rectangular pulse of described square-wave signal.
4. laser pulse differential circuit as claimed in claim 1, is characterized in that, described laser pulse module comprises triode and the laser tube being connected with described triode.
5. laser pulse differential circuit as claimed in claim 4, is characterized in that, described triode is high-frequency triode.
6. a driving method for the laser pulse differential circuit as described in claim 1 to 5 any one, is characterized in that, comprising:
Electric capacity based in described differential circuit and/or the variation of resistance, change the pulsewidth of spike, and described spike is obtained after by described differential circuit by the rectangular pulse of square-wave signal;
Pulsewidth based on described spike, controls described laser pulse module and results from the laser that described pulsewidth matches.
7. the driving method of laser pulse differential circuit as claimed in claim 6, it is characterized in that, the electric capacity in described differential circuit and/or the variation of resistance refer to that the capacitance of controlling the electric capacity in described differential circuit changes according to first threshold and/or the resistance of controlling the resistance in described differential circuit changes according to Second Threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210322200.XA CN103684361A (en) | 2012-09-04 | 2012-09-04 | Laser pulse differentiating circuit and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210322200.XA CN103684361A (en) | 2012-09-04 | 2012-09-04 | Laser pulse differentiating circuit and driving method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103684361A true CN103684361A (en) | 2014-03-26 |
Family
ID=50320853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210322200.XA Pending CN103684361A (en) | 2012-09-04 | 2012-09-04 | Laser pulse differentiating circuit and driving method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103684361A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI579740B (en) * | 2014-07-03 | 2017-04-21 | Ｓｍｋ股份有限公司 | Impact generating actuator and touch panel |
| CN108181621A (en) * | 2016-12-08 | 2018-06-19 | 北京万集科技股份有限公司 | A kind of bidifly light drive circuit and scanning type laser radar ranging equipment and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060045437A1 (en) * | 2004-08-31 | 2006-03-02 | Jim Tatum | Laser package with digital electronic interface |
| CN101132114A (en) * | 2007-08-22 | 2008-02-27 | 中国科学院上海光学精密机械研究所 | Continuously adjustable nanosecond-impulse semiconductor laser driving power supply |
| CN101640373A (en) * | 2008-07-31 | 2010-02-03 | 中国科学院半导体研究所 | Continuous adjustable nanosecond narrow-pulse semiconductor laser module |
| CN101895058A (en) * | 2010-07-07 | 2010-11-24 | 中国科学院上海光学精密机械研究所 | High-speed narrow pulse modulation driving power supply for semiconductor laser |
-
2012
- 2012-09-04 CN CN201210322200.XA patent/CN103684361A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060045437A1 (en) * | 2004-08-31 | 2006-03-02 | Jim Tatum | Laser package with digital electronic interface |
| CN101132114A (en) * | 2007-08-22 | 2008-02-27 | 中国科学院上海光学精密机械研究所 | Continuously adjustable nanosecond-impulse semiconductor laser driving power supply |
| CN101640373A (en) * | 2008-07-31 | 2010-02-03 | 中国科学院半导体研究所 | Continuous adjustable nanosecond narrow-pulse semiconductor laser module |
| CN101895058A (en) * | 2010-07-07 | 2010-11-24 | 中国科学院上海光学精密机械研究所 | High-speed narrow pulse modulation driving power supply for semiconductor laser |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI579740B (en) * | 2014-07-03 | 2017-04-21 | Ｓｍｋ股份有限公司 | Impact generating actuator and touch panel |
| US9960713B2 (en) | 2014-07-03 | 2018-05-01 | Smk Corporation | Impact producing actuator and touch panel |
| CN108181621A (en) * | 2016-12-08 | 2018-06-19 | 北京万集科技股份有限公司 | A kind of bidifly light drive circuit and scanning type laser radar ranging equipment and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103731123B (en) | A kind of ultra-wideband impulse signal generation device based on memristor | |
| US20140063593A1 (en) | Capacitor discharge pulse drive circuit with fast recovery | |
| CN104104362B (en) | High-amplitude picosecond balance pulse signal generator | |
| US8981861B2 (en) | Injection locked pulsed oscillator | |
| CN204885822U (en) | Semiconductor laser drive circuit reaches semiconductor laser including this circuit | |
| CN103929154A (en) | Picosecond single recurrent pulse transmitter | |
| CN114336274B (en) | Laser driving circuit and laser | |
| CN108011293B (en) | Narrow pulse infrared semiconductor laser emission circuit | |
| CN104795976A (en) | Driving control circuit capable of shutting down PMOS switch tube rapidly and designing method thereof | |
| US10938384B2 (en) | Pulse modulator | |
| CN103684361A (en) | Laser pulse differentiating circuit and driving method thereof | |
| CN106898946A (en) | For the turnable pulse width formula pulse generating circuit of semiconductor laser | |
| CN202206352U (en) | Serial concatenated nanosecond pulse source based on single-stage avalanche triode | |
| Gerding et al. | Generation of short electrical pulses based on bipolar transistorsny | |
| CN115085700A (en) | Solid-state pulse source output waveform delay control device and method | |
| CN100587396C (en) | Semiconductor laser drive device for laser distance measuring instrument | |
| CN107241085B (en) | Large-amplitude high-repetition-frequency nanosecond balanced pulse signal generator | |
| CN105049000A (en) | Optional-pulse-width narrow pulse generator | |
| CN103929089A (en) | Rapid leading edge step pulse generator | |
| CN102594303A (en) | Narrow-pulse generation circuit | |
| CN105743441B (en) | The adjustable rapid large-current pulse exciting circuit of slope in a kind of pulsewidth, amplitude and arteries and veins | |
| Wang et al. | Design of an ultra-wideband pulse generator based on avalanche transistor | |
| Wu et al. | Design of electronic circuits of nanosecond impulser based on avalanche transistor | |
| CN202475382U (en) | Narrow pulse generation circuit | |
| CN112636148A (en) | Short pulse laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140326 |