CN102545038A - Distributed feedback laser driving and modulating device and trace gas detection system - Google Patents
Distributed feedback laser driving and modulating device and trace gas detection system Download PDFInfo
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- CN102545038A CN102545038A CN2011104524680A CN201110452468A CN102545038A CN 102545038 A CN102545038 A CN 102545038A CN 2011104524680 A CN2011104524680 A CN 2011104524680A CN 201110452468 A CN201110452468 A CN 201110452468A CN 102545038 A CN102545038 A CN 102545038A
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Abstract
The invention discloses a distributed feedback laser driving and modulating device and a trace gas detection system, which relate to the technical field of lasers. The distributed feedback laser driving and modulating device comprises a signal generating module and a conversion module, wherein the signal generating module is used for generating signals for driving and modulating a distributed feedback laser, and the conversion module is connected with the signal generating module and used for performing voltage and current conversion on the signals generated by the signal generating module and outputting current signals for driving the distributed feedback laser. Compared with the traditional driving and modulating methods, the distributed feedback laser driving and modulating device and the trace gas detection system have higher integrated degree and better stability, and can well meet work requirements for driving the distributed feedback laser and modulating wavelength.
Description
Technical field
The present invention relates to the laser technique field, relate in particular to a kind of distributed feedback laser and drive modulating device and trace gas detection system.
Background technology
Distributed feedback laser has advantages such as monochromaticjty is good, the coherence is good, the beam collimation precision high, volume is little, easy to use, has obtained application more and more widely in the communications field and trace gas detection range.Especially in recent years, distributed feedback laser extensively is used in the open light path gas-monitoring, like methane gas monitoring, vehicle exhaust detection, natural gas leaking monitoring etc.It is harsh that yet semiconductor laser requires condition of work, and the fluctuation of drive current not only can cause the laser intensity noise of laser, also can cause the broadening of output wavelength spectral line width.In the open laser absorption spectrum gas monitoring system of forming by distributed feedback laser, need modulate the output wavelength of laser and could obtain higher gas detecting precision.Therefore, the accuracy of the stability of distributed feedback laser power output and wavelength-modulated is the principal element that influences the detection system performance.
At present; Both at home and abroad doing a few thing aspect the driving of distributed feedback laser and the wavelength-modulated; Utilize the simulation discharge circuit to produce needed modulation waveform mostly; As adopt the mode of singlechip interruption to produce square wave, obtain corresponding modulation waveform (triangular wave is with sinusoidal wave) through analog integration and filter circuit then.This method can realize the wavelength-modulated to distributed feedback laser, but following shortcoming is arranged:
1, the analog circuit complicacy is huge, is unfavorable for the integrated of system, and the degree of modularity is low;
2, poor stability, for the occasion that laser stability is had relatively high expectations, analog control mode is difficult to meet the demands;
3, the noise that causes of analog circuit itself is bigger, causes laser power poor stability and wavelength-modulated precision low.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve is: provide a kind of distributed feedback laser simple in structure, that stability is strong and modulation accuracy is higher to drive modulating device and trace gas detection system.
(2) technical scheme
For addressing the above problem, the invention provides a kind of distributed feedback laser and drive modulating device, this device comprises: signal generating module is used to generate and drives and the signal of modulated laser device with distributed feedback; Modular converter links to each other with said signal generating module, is used for the signal that said signal generating module generates is carried out the electric current and voltage conversion, and output drives the current signal of said distributed feedback laser.
Preferably, said signal generating module further comprises: the drive signal generating unit is used to generate the drive signal of said distributed feedback laser being carried out length scanning; The modulation signal generating unit is used to generate the modulation signal that said distributed feedback laser is modulated; Control unit links to each other with said drive signal generating unit and said modulation signal generating unit respectively, is used to control said drive signal generating unit and said modulation signal generating unit generates corresponding signal.
Preferably, said drive signal is a triangular signal, and said modulation signal is a sine wave signal.
Preferably; Said signal generating module further comprises: superpositing unit; Link to each other with said drive signal generating unit and said modulation signal generating unit respectively; Be used for the signal of said drive signal generating unit and the generation of said modulation signal generating unit is superposeed, the signal that stack is obtained exports said modular converter to.
Preferably, said drive signal generating unit is a digital to analog converter.
Preferably, said modulation signal generating unit is a Direct Digital Synthesizer.
Preferably, said control unit is a single-chip microcomputer.
Preferably, this device also comprises: temperature control module is used for the base reservoir temperature of said distributed feedback laser is controlled between constant region.
The present invention also provides a kind of trace gas detection system, and this system comprises said apparatus, and said device is used for the light source of said system is driven and/or modulates.
(3) beneficial effect
Apparatus and system of the present invention is with respect to traditional driving and modulation means, and integrated level is higher, stability is better, can satisfy driving and wavelength-modulated work to distributed feedback laser well.
Description of drawings
Fig. 1 is that the distributed feedback laser of embodiment 1 drives the modulating device structural representation;
Fig. 2 is that the distributed feedback laser of embodiment 2 drives the modulating device structural representation.
Embodiment
The distributed feedback laser that the present invention proposes drives modulating device and trace gas detection system, specifies as follows in conjunction with accompanying drawing and embodiment.
Distributed feedback laser drive adjusting device of the present invention is used for distributed feedback laser is driven and wavelength-modulated; (through changing the setting of circuit parameter; Application can comprise butterfly encapsulated laser, TO encapsulated laser or the like) (distributed feedback laser of the present invention is driven modulating device to be connected on the distributed feedback laser to drive test through the scene to distributed feedback laser; Laser is launched the laser through ovennodulation; Use then with the relevant photoelectric detector of this laser output wave band and detect the laser that this laser sends; Observe the waveform that photoelectric detector is exported through oscilloscope or other electronic equipments, watch the modulation effect of laser output wavelength), under different external environments, can obtain stable Laser emission power and accurate modulation effect.
Embodiment 1
As shown in Figure 1, the distributed feedback laser of present embodiment drives modulating device (among the figure shown in the frame of broken lines) and comprising: signal generating module, modular converter and temperature control module.Wherein:
Signal generating module is used to generate and drives and the signal of modulated laser device with distributed feedback.Modular converter links to each other with signal generating module, is used for the signal that signal generating module generates is carried out the electric current and voltage conversion, and output drives the current signal of distributed feedback laser.Temperature control module is used for the base reservoir temperature of distributed feedback laser is controlled between constant region, can be the semiconductor refrigeration chip that is mounted on the laser substrate, realizes the control to the laser base reservoir temperature with PID (ratio, integration, differential control) mode.
In the present embodiment, signal generating module further comprises: drive signal generating unit, modulation signal generating unit, control unit and superpositing unit.Wherein:
The drive signal generating unit is used to generate the triangular wave drive signal of distributed feedback laser being carried out length scanning, and this drive signal can drive laser produce continuous wavelength variations, to realize wavelength scanning within the specific limits; The modulation signal generating unit is used to generate the sinewave modulation signal that distributed feedback laser is modulated; Control unit links to each other with drive signal generating unit and modulation signal generating unit respectively, is used for the controlling and driving signal generating unit and the modulation signal generating unit generates corresponding signal; Superpositing unit links to each other with drive signal generating unit and modulation signal generating unit respectively; Be used for the signal of drive signal generating unit and the generation of modulation signal generating unit is superposeed; The signal that stack is obtained exports modular converter to, and the signal that stack obtains is that final distributed feedback laser drives modulation signal.
Preferably, the drive signal generating unit can be digital to analog converter (D/A); The modulation signal generating unit can be Direct Digital Synthesizer (DDS); Control unit can be single-chip microcomputer; Superpositing unit is the simulation supercircuit.
Modular converter can be for being made up of a current/charge-voltage convertor discharge circuit, its final voltage signal that superpositing unit is obtained is as its input signal, and its output signal is the drive signal of laser.Modular converter also has defencive function, can effectively avoid distributed feedback laser to receive the impact of overvoltage or high pulse signal.
As shown in Figure 2, the distributed feedback laser of present embodiment drives modulating device and comprises:
Single-chip Controlling unit 1, D/A chip 2 (like DAC0832), DDS chip (like AD9850) 3, simulation supercircuit 4 and voltage-to-current modular converter 5.
Frequency control word is write to D/A chip 2 in Single-chip Controlling unit 1, and the sawtooth waveforms that to make it produce a frequency be 10Hz is as the length scanning signal of laser 6; Write frequency, phase control words for the DDS chip, make it produce the wavelength-modulated signal of the sine wave of a 5Hz as laser 6.Simulation supercircuit 4 stacks up sawtooth signal and sine wave signal; Export voltage-to-current modular converter 5 to; Voltage-to-current modular converter 5 changes into current signal with the voltage signal that front sawtooth waveforms and sine-wave superimposed obtain, and this current signal can drive laser 6 be worked stably and normally.And this voltage-to-current modular converter 4 can play the effect of protection to laser 6, can effectively avoid laser to receive the impact of overvoltage or high pulse signal.
In addition, the present invention also provides a kind of trace gas detection system, for example based on the technological trace gas detection system of tunable diode absorption spectrum (TDLAS), but is not limited thereto.
This system adopts distributed feedback laser of the present invention to drive drive unit and/or the modulating apparatus of modulating device as its light source.The laser that process driving modulating device of the present invention drives and modulates is as the light source of TDLAS gas detecting system; This light source sends the light of place, GAS ABSORPTION peak wave band; Behind one section open light path that contains tested gas; This light is detected by photodetector, thereby can accurately be finally inversed by the concentration of tested gas.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (9)
1. a distributed feedback laser drives modulating device, it is characterized in that this device comprises:
Signal generating module is used to generate and drives and the signal of modulated laser device with distributed feedback;
Modular converter links to each other with said signal generating module, is used for the signal that said signal generating module generates is carried out the electric current and voltage conversion, and output drives the current signal of said distributed feedback laser.
2. device as claimed in claim 1 is characterized in that, said signal generating module further comprises:
The drive signal generating unit is used to generate the drive signal of said distributed feedback laser being carried out length scanning;
The modulation signal generating unit is used to generate the modulation signal that said distributed feedback laser is modulated;
Control unit links to each other with said drive signal generating unit and said modulation signal generating unit respectively, is used to control said drive signal generating unit and said modulation signal generating unit generates corresponding signal.
3. device as claimed in claim 2 is characterized in that, said drive signal is a triangular signal, and said modulation signal is a sine wave signal.
4. device as claimed in claim 3 is characterized in that, said signal generating module further comprises:
Superpositing unit; Link to each other with said drive signal generating unit and said modulation signal generating unit respectively; Be used for the signal of said drive signal generating unit and the generation of said modulation signal generating unit is superposeed, the signal that stack is obtained exports said modular converter to.
5. like each described device of claim 2-4, it is characterized in that said drive signal generating unit is a digital to analog converter.
6. like each described device of claim 2-4, it is characterized in that said modulation signal generating unit is a Direct Digital Synthesizer.
7. like each described device of claim 2-4, it is characterized in that said control unit is a single-chip microcomputer.
8. device as claimed in claim 1 is characterized in that, this device also comprises:
Temperature control module is used for the base reservoir temperature of said distributed feedback laser is controlled between constant region.
9. a trace gas detection system is characterized in that, this system comprises each described device of claim 1-8, and said device is used for the light source of said system is driven and/or modulates.
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Cited By (4)
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| CN102809547A (en) * | 2012-08-28 | 2012-12-05 | 昆山昱翌辉华电子科技有限公司 | Method and device for detecting trace gas by scattering-enhanced tunable diode laser |
| CN103475311A (en) * | 2013-09-03 | 2013-12-25 | 周健 | Special circuit for signal generation in TDLAS (Tunable Diode Laser Absorption Spectroscopy) |
| CN108181269A (en) * | 2017-12-28 | 2018-06-19 | 中国科学院长春光学精密机械与物理研究所 | A kind of Laser Modulation driving device and the method for removing ambient noise |
| CN108872147A (en) * | 2018-06-22 | 2018-11-23 | 中国科学院长春光学精密机械与物理研究所 | A kind of generating device of laser and gas concentration detection apparatus based on TDLAS technology |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809547A (en) * | 2012-08-28 | 2012-12-05 | 昆山昱翌辉华电子科技有限公司 | Method and device for detecting trace gas by scattering-enhanced tunable diode laser |
| CN103475311A (en) * | 2013-09-03 | 2013-12-25 | 周健 | Special circuit for signal generation in TDLAS (Tunable Diode Laser Absorption Spectroscopy) |
| CN103475311B (en) * | 2013-09-03 | 2016-05-25 | 周健 | In a kind of TDLAS, signal produces special circuit |
| CN108181269A (en) * | 2017-12-28 | 2018-06-19 | 中国科学院长春光学精密机械与物理研究所 | A kind of Laser Modulation driving device and the method for removing ambient noise |
| CN108181269B (en) * | 2017-12-28 | 2020-10-16 | 中国科学院长春光学精密机械与物理研究所 | Laser modulation driving device and method for removing background noise |
| CN108872147A (en) * | 2018-06-22 | 2018-11-23 | 中国科学院长春光学精密机械与物理研究所 | A kind of generating device of laser and gas concentration detection apparatus based on TDLAS technology |
| CN108872147B (en) * | 2018-06-22 | 2020-07-24 | 中国科学院长春光学精密机械与物理研究所 | Laser generating device and gas concentration detection device based on TD L AS technology |
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Application publication date: 20120704 |