CN108918440A - A kind of Laser stealth material system and method - Google Patents
A kind of Laser stealth material system and method Download PDFInfo
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- CN108918440A CN108918440A CN201810540731.3A CN201810540731A CN108918440A CN 108918440 A CN108918440 A CN 108918440A CN 201810540731 A CN201810540731 A CN 201810540731A CN 108918440 A CN108918440 A CN 108918440A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Abstract
The invention discloses a kind of Laser stealth material system and methods, the first acquisition mode trigger signal and the second acquisition mode trigger signal can be alternately sent to signal generator by trigger, so that Laser stealth material system of the invention replaces between the first acquisition mode (range measurement state) and the second acquisition mode (gas concentration measurement state), so as to realize two kinds of functions of range measurement and gas concentration measurement in such a way that timesharing measures.The present invention realizes range measurement function on the basis of not changing the optical frame of laser gas remote measurement device, simplifies structure, reduces the cost of detection system and reduces volume.
Description
Technical field
The present invention relates to technical field of laser detection, in particular to a kind of Laser stealth material system and method.
Background technique
Currently, Laser stealth material technology has been widely used in the detection of harmful gas concentration, especially as methane
This gas for being difficult directly to measure its concentration.Laser stealth material gas concentration mainly has following advantage：It surveys
Accuracy of measurement is high；Measuring speed is faster than other measurement methods, response is rapid；In-site measurement can be achieved；Requirement to ambient enviroment is not
Height, severe gaseous environment will not seriously affect measurement accuracy；The technology can be applied at such as tens kinds of methane, hydrogen sulfide etc.
In common gas concentration detection.
In the application of Laser stealth material gas concentration (hereinafter referred to as laser gas remote measurement), the result of general telemetering
The only concentration of gas, and the distance of telemetering can not be obtained.In order to realizing the telemetering that can not only carry out gas concentration, but also
The telemetering of distance can be carried out, a laser ranging system is installed additional generally outside laser gas remote measurement device in the prior art and comes in fact
The now measurement of distance, it is clear that it although can be realized the telemetering of distance by installing laser ranging system additional, but due to attached volume
Outer equipment results in that remote sensing device overall structure is more complicated, and cost and volume have greatly increased.
Summary of the invention
In order to solve problems in the prior art, the embodiment of the invention provides a kind of Laser stealth material system and method,
To realize the telemetering for carrying out distance on the basis of not changing the optical frame of laser gas remote measurement device, simplifies structure, reduce
The cost of single unit system simultaneously reduces volume.
The first aspect of the present invention provides a kind of Laser stealth material system, which includes：
Laser emission element and laser pick-off unit, the laser emission element are used for emission detection laser, the laser
Receiving unit exports detection result after handling the reflection signal for receiving laser reflection signal,
The laser emission element includes trigger, signal generator, laser controller and laser, wherein
The trigger, for sending acquisition mode trigger signal, so that the detection system is in the first acquisition mode
And second between acquisition mode alternately, first acquisition mode is range measurement state, and second acquisition mode is that gas is dense
Spend measuring state；The acquisition mode trigger signal includes the first acquisition mode trigger signal and the second acquisition mode triggering letter
Number；
The signal generator, the acquisition mode trigger signal sent for receiving the trigger, according to the detection
State triggers generate modulated signal, and the modulated signal is injected the laser controller, so that the laser control
Device processed modulates the output of the laser；The modulated signal includes the first modulated signal and the second modulated signal, and described the
One modulated signal is corresponding with the first acquisition mode trigger signal, second modulated signal and second acquisition mode
Trigger signal is corresponding.
Further, the light for the laser that the laser controller exports the laser according to first modulated signal
It is modulated by force, and the wavelength of the laser of the laser output is made to avoid the characteristic absorption peak wavelength region for being tested gas.
Further, first modulated signal includes the sine wave of at least two frequencies.
Further, the wave for the laser that the laser controller exports the laser according to second modulated signal
Length is modulated, so that the scanning wavelength range of the laser covers the characteristic absorption peak wavelength of tested gas.
Further, the laser emission element further includes external modulation crystal, and the external modulation crystal swashs with described
The output end of light device connects.
Further, the laser pick-off unit includes photodetector, phase discriminator and signal processor, wherein
The photodetector is converted to electric signal for receiving laser reflection signal, and by the laser reflection signal；
The input terminal of the phase discriminator is connect with the photodetector and signal generator respectively, for from the light
Electric explorer received signal carries out phase demodulation comparison, and the signal after comparison is sent to signal processor；
The signal processor includes distance calculation module and gas concentration computing module, the distance calculation module and institute
The output end connection for stating phase discriminator, for being calculated according to the signal after the comparison and exporting distance measurement result；The gas
Concentration calculation module, for calculating simultaneously output gas concentration detection result according to the electric signal after conversion.
The second aspect of the present invention provides a kind of Laser stealth material method, and this method includes：
Trigger alternately sends the first acquisition mode trigger signal and the second acquisition mode trigger signal to signal generator；
The signal generator receives the first acquisition mode trigger signal or the second acquisition mode trigger signal, according to
The first acquisition mode trigger signal or the second acquisition mode trigger signal generate the first modulated signal or the second modulated signal,
And first modulated signal or the second modulated signal are injected into laser controller；
The laser controller modulates the output of laser according to first modulated signal or the second modulated signal.
Further, the trigger alternately sends the first acquisition mode trigger signal and the second acquisition mode trigger signal
Include to signal generator：
The trigger alternately sends the first acquisition mode trigger signal and the second detection shape according to the preset time interval
State trigger signal is to signal generator；Alternatively,
The trigger sends the first acquisition mode after the signal for receiving laser pick-off unit output detection result
Trigger signal or the second acquisition mode trigger signal are to signal generator.
Further, the laser controller is according to first modulated signal or the second modulated signal to the defeated of laser
It modulates out and includes：
The laser controller is modulated the light intensity for the laser that laser exports according to first modulated signal, and
So that the wavelength of the laser of the laser output avoids the characteristic absorption peak wavelength region of tested gas；
The laser controller is modulated the wavelength for the laser that laser exports according to second modulated signal, with
So that the scanning wavelength range of the laser covers the characteristic absorption peak wavelength of tested gas.
Further, after the laser controller modulates the output of laser according to first modulated signal, institute
The method of stating further includes：
Photodetector receives laser reflection signal, and the laser reflection signal is sent to phase discriminator；Phase discriminator pair
Phase demodulation comparison is carried out from the photodetector received signal, and the signal after comparison is sent to the distance of signal processor
Computing module；The distance calculation module of the signal processor calculates according to the signal after the comparison and exports distance measurement knot
Fruit；
After the laser controller modulates the output of laser according to second modulated signal, the method is also wrapped
It includes：
Photodetector receives laser reflection signal, and the laser reflection signal is converted to electric signal；Signal processing
The gas concentration of device calculates module and calculates simultaneously output gas concentration detection result according to the electric signal after conversion.
A kind of Laser stealth material system and method bring beneficial effect provided by the invention is：
Trigger in the present invention can alternately send the first acquisition mode trigger signal and the triggering of the second acquisition mode
Signal to signal generator so that Laser stealth material system of the invention in the first acquisition mode (range measurement state) and
Between second acquisition mode (gas concentration measurement state) alternately, i.e., realize that range measurement and gas are dense in such a way that timesharing measures
Degree two kinds of functions of measurement.In compared to the prior art by way of installing laser ranging system additional, the present invention is not changing laser
Range measurement function is realized on the basis of the optical frame of gas remote measurement device, simplifies structure, reduces detection system
Cost simultaneously reduces volume.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the structural schematic diagram of Laser stealth material system provided in an embodiment of the present invention；
Fig. 2 is that one kind of Laser stealth material system provided in an embodiment of the present invention is applicable in detection index path；
Fig. 3 is that the another kind of Laser stealth material system provided in an embodiment of the present invention is applicable in detection index path；
In figure：1- lens, 2- are tested gas, 3- reflecting surface, 4- exploring laser light.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment 1
Referring to FIG. 1, its structural schematic diagram for showing a kind of Laser stealth material system provided in an embodiment of the present invention,
The Laser stealth material system 100 can realize the telemetering of distance and the telemetering of gas concentration in such a way that timesharing measures.
As shown in Figure 1, the Laser stealth material system 100 includes laser emission element 10 and laser pick-off unit 20, swash
Light emitting unit 10 is used for emission detection laser, and laser pick-off unit 20 is used to receive the laser reflection signal after reflection, and right
The reflection signal is handled and exports detection result.
Referring to FIG. 2, a kind of its applicable index path for showing Laser stealth material system provided in an embodiment of the present invention.
As shown in Fig. 2, the exploring laser light 4 that laser emission element 10 emits wears the tested gas 2 of injection, wherein there is part light may be by gas
Body absorbs, this depends on the wavelength for injecting the laser of tested gas.Reflecting surface 3 is reached through the laser of gas, it is anti-through reflecting surface 3
It is emitted back towards and carrys out a part of light, this part light is threaded back through tested gas 2 again, since light more divides by reflection for several times, deflecting light beams
It dissipates, so light beam is gathered together by the way that lens 1 are arranged in the optical path, the optical signal after aggregation is received by laser pick-off unit 20
And it handles.Wherein, lens 1 can be Fresnel Lenses, or other lens that can be realized converging action.In addition, thoroughly
Mirror 1 can be single lens, be also possible to the lens group of multiple lens compositions.
With continued reference to Fig. 1, laser emission element 10 includes trigger 101 interconnected, signal generator 102, laser
Controller 103 and laser 104.
Laser 104 can use tunable diode laser, which is used as probe source, passes through laser
Controller 103 carry out laser 104 temperature and electric current control, and then adjust laser 104 export laser light intensity and
Central wavelength.
Trigger 101 is connect with signal generator 102, and the trigger 101 is for sending acquisition mode trigger signal to letter
Number generator 102 so that Laser stealth material system 100 between the first acquisition mode and the second acquisition mode alternately, wherein
First acquisition mode is range measurement state, and the second acquisition mode is gas concentration measurement state, correspondingly, above-mentioned acquisition mode
Trigger signal includes the first acquisition mode trigger signal and the second acquisition mode trigger signal.It is visited when trigger 101 sends first
When surveying State triggers, Laser stealth material system 100 is in the first acquisition mode (range measurement state), works as trigger
When 101 the second acquisition mode trigger signal of transmission, Laser stealth material system 100 is in the second acquisition mode (gas concentration
Measuring state).
In embodiments of the present invention, Laser stealth material system 100 is handed between the first acquisition mode and the second acquisition mode
For being specifically, if present laser remote sensing system 100 is in the first acquisition mode, after the first acquisition mode,
Laser stealth material system 100 can enter the second acquisition mode；If present laser remote sensing system 100 is in the second detection
State, then after the second acquisition mode, Laser stealth material system 100 can enter the first acquisition mode, i.e., of the invention
Laser stealth material system 100 can both carry out the telemetering of distance, the telemetering of gas concentration can also be carried out, and distance is distant
It surveys and the telemetering of gas concentration can be carried out in different moments.
In embodiments of the present invention, timer can be set in trigger 101, so that trigger 101 is according to default
Time interval alternately send the first acquisition mode trigger signal and the second acquisition mode trigger signal.It should be noted that pre-
If time interval should meet Laser stealth material system 100 complete certain acquisition mode under measurement.
In embodiments of the present invention, trigger 101 can also be connect with laser pick-off unit 20, the laser pick-off unit
20 when exporting detection result, and the signal of output detection result can be sent to trigger 101, and trigger 101 receives laser and connects
The signal for the output detection result that unit 20 is sent is received, and upon receipt of the signal, sends another acquisition mode triggering
Signal.For example, present laser remote sensing system 100 is in the first acquisition mode (range measurement state), and laser pick-off
Unit 20 output range measurement as a result, at this time laser pick-off unit 20 can to trigger 101 send output range measurement
As a result signal, then trigger 101 sends the triggering of the second acquisition mode after the signal for receiving output range measurements
Signal is to signal generator 102, so that Laser stealth material system 100 enters the second acquisition mode (gas concentration measurement shape
State).
The input terminal of signal generator 102 is connect with trigger 101, and output end is connect with laser controller 103.Signal
Generator 102 is used to receive the acquisition mode trigger signal of the transmission of trigger 101, and is generated according to the acquisition mode trigger signal
The modulated signal is injected into laser controller 103 by corresponding modulated signal, to pass through laser controller 103 to laser
The output of device 104 is modulated.The modulated signal that signal generator 102 generates is opposite with the acquisition mode trigger signal that it receives
It answers, when it is the first acquisition mode trigger signal that signal generator 102 is received, generates the first modulated signal；When signal is sent out
Raw device 102 is received when being the second acquisition mode trigger signal, generates the second modulated signal.
When Laser stealth material system 100 is in the first acquisition mode, in order to avoid exploring laser light be actually taken up by gas with
And the interference of other modulated signals, in embodiments of the present invention, laser controller 103 is according to the first modulated signal to laser
The wavelength for the laser that the light intensity of the laser of 104 outputs is modulated, and laser 104 is exported avoids the feature of tested gas
Absorption peak wavelength region.In this way, the wavelength for the laser that laser 104 exports will not be in tested gas when carrying out range measurement
Absorption peak near.
In embodiments of the present invention, the first modulated signal package that the light intensity of the laser exported to laser 104 is modulated
The sine wave of at least two frequencies is included, to realize the measurement of absolute distance.Specifically, be referred to following formula obtain absolutely away from
From value,
(a*2pi+phase1)：(b*2pi+phase2)=freq1：freq2
For low frequency signal, can usually take a=0, therefore, above-mentioned formula can simplify for：
phase1：(b*2pi+phase2)=freq1：freq2
Wherein, freq1 and freq2 is respectively the frequency of the sine wave of two kinds of frequencies；
Phase1 and phase2 is phase pushing figure corresponding with freq1 and freq2, which can pass through
Phase discriminator obtains；
By determining that b can obtain absolute distance value.
In practical applications, the precision for if desired improving range measurement, then can be further added by a higher modulating frequency
Sine wave, more accurate phase delay amount can be thus obtained, to obtain more accurate absolute distance value to be measured.
When laser 104 is not able to satisfy the modulation of the light intensity of output laser, laser emission element 10 can also include outer
Portion's modulation crystal 105, as shown in figure 3, the external modulation crystal 105 is connect with the output end of laser 104, for laser
The intensity modulation of the laser of 104 outputs.In embodiments of the present invention, external modulation crystal 105 can be electro-optic crystal or sound
Luminescent crystal.
When Laser stealth material system 100 is in the second acquisition mode, laser controller 103 is according to the second modulated signal
The wavelength for the laser that laser 104 exports is modulated, so that the scanning wavelength range of laser 104 covers tested gas
Characteristic absorption peak wavelength.
In embodiments of the present invention, laser pick-off unit 20 may include photodetector 201, phase discriminator 202 and signal
Processor 203.Certainly, which can also include lock-in amplifier 204.
Laser reflection information is converted to electric signal for receiving laser reflection signal by photodetector 201.The photoelectricity
Electric signal after conversion can be sent to phase discriminator 202 by detector 201.When laser pick-off unit 20 includes lock-in amplifier
When 204, the electric signal after conversion can also be sent to lock-in amplifier 204 by photodetector 201.Photodetector 201 can
On the light aggregation position for the lens being arranged in optical path shown in Fig. 2.
Specifically, photodetector 201 is for receiving when Laser stealth material system 100 is in the first acquisition mode
Laser reflection signal, and the electric signal after conversion is sent to phase discriminator 202；When Laser stealth material system 100 is in second
When acquisition mode, the electric signal after conversion is sent to signal processing for receiving laser reflection signal by photodetector 201
Device 203, alternatively, the electric signal after the conversion is first sent to lock-in amplifier 204 by photodetector 201.
The input terminal of phase discriminator 202 is connect with photodetector 201 and signal generator 102 respectively, for from photoelectricity
201 received signal of detector carries out phase demodulation comparison, and the signal after comparison is sent to signal processor 203.
When laser pick-off unit 20 includes lock-in amplifier 204, the input terminal of the lock-in amplifier 204 can respectively with
Photodetector 201 and signal generator 102 connect, for the demodulation from 201 received signal of photodetector, and will solution
Signal after tune is sent to signal processor 203.
Signal processor 203 includes distance calculation module 2031 and gas concentration computing module 2032, which calculates mould
Block 2031 is connect with the output end of phase discriminator 202, for being calculated according to the signal after comparison and exporting distance measurement result.
Gas concentration calculates module 2032, for calculating simultaneously output gas concentration detection knot according to the electric signal after conversion
Fruit.The gas concentration calculates module 2032 and can connect with the output end of photodetector 201, when laser pick-off unit 20 includes
When lock-in amplifier 204, which calculates module 2032 and can also connect with the output end of lock-in amplifier 204.
In embodiments of the present invention, the measurement method of distance can use phase ranging method, can also use pulse laser
Flight time measure.
Phase ranging method is to measure continuous laser modulated signal to come indirectly by the phase difference between signal before and after reflecting surface
The propagation time T of signal is measured on ground, then finds out target range L according to T, and specific calculation formula is as follows：
λ/2 L=C × T/2=(N+ Δ N)
Wherein, N is the wavelength period integer of modulating wave；The decimal of insufficient half-wavelength of the Δ N by survey line comprising modulating wave
Partially (Δ N=Δ φ/2 π).
Pulse type laser ranging is to measure laser in the case that spread speed is constant in air based on laser to reflecting surface
Between two-way time, to measure target range indirectly.
In embodiments of the present invention, the measurement method of gas concentration can use direct absorption process, can also use harmonic wave
Method.
Direct absorption process drives laser by delta current, so that the wavelength average rate scanning of laser output laser passes through
Tested gas absorption spectrum line analyzes signal amplitude, it is dense can to obtain gas by extracting the gas absorption signal in exploring laser light
Spend information.
Harmonic Method modulates the wavelength of laser using sinusoidal current, so that gas absorption signal can be embodied in modulating frequency
On fundamental frequency and frequency multiplication, by analyzing even harmonics signal amplitude, it can calculate and obtain gas concentration information.
In Laser stealth material system of the invention, trigger can alternately send the first acquisition mode trigger signal and
Second acquisition mode trigger signal is to signal generator, so that Laser stealth material system of the invention is in the first acquisition mode
Between (range measurement state) and the second acquisition mode (gas concentration measurement state) alternately, i.e., it is realized in such a way that timesharing measures
Two kinds of functions of range measurement and gas concentration measurement.In compared to the prior art by way of installing laser ranging system additional, this
Invention realizes range measurement function on the basis of not changing the optical frame of laser gas remote measurement device, simplifies structure,
It reduces the cost of detection system and reduces volume.
Embodiment 2
The present embodiment provides a kind of Laser stealth material method, this method can be visited using the laser remote sensing in embodiment 1
Examining system 100.Specifically, the Laser stealth material method includes the following steps：
S1, trigger alternately send the first acquisition mode trigger signal and the second acquisition mode trigger signal to signal and occur
Device；
S2, signal generator receives the first acquisition mode trigger signal or the second acquisition mode trigger signal, according to first
Acquisition mode trigger signal or the second acquisition mode trigger signal generate the first modulated signal or the second modulated signal, and by first
Modulated signal or the second modulated signal inject laser controller；
S3, laser controller modulate the output of laser according to the first modulated signal or the second modulated signal.
It will of course be understood that, after step s 3, laser emits modulated laser, and laser passes through quilt
It surveys after gas by reflecting surface, is then returned and be received by a photoelectric detector by former direction and be changed into electric signal.
When trigger 101 send be the first acquisition mode trigger signal when, Laser stealth material system 100 enter first
Acquisition mode (range measurement state), under the acquisition mode, laser reflection signal is changed into electric signal by photodetector 201
Afterwards, which is sent to phase discriminator 202；Phase discriminator 202 carries out phase demodulation ratio to from 201 received signal of photodetector
Compared with, and the signal after comparison is sent to the distance calculation module 2031 of signal processor；The distance of signal processor calculates mould
Block 2031 calculates according to the signal after comparison and exports distance measurement result.
In embodiments of the present invention, the measurement method of distance can use phase ranging method, can also use pulse laser
Flight time measure.
Phase ranging method is to measure continuous laser modulated signal to come indirectly by the phase difference between signal before and after reflecting surface
The propagation time T of signal is measured on ground, then finds out target range L according to T, and specific calculation formula is as follows：
λ/2 L=C × T/2=(N+ Δ N)
Wherein, N is the wavelength period integer of modulating wave；The decimal of insufficient half-wavelength of the Δ N by survey line comprising modulating wave
Partially (Δ N=Δ φ/2 π).
Pulse type laser ranging is to measure laser in the case that spread speed is constant in air based on laser to reflecting surface
Between two-way time, to measure target range indirectly.
When trigger 101 send be the second acquisition mode trigger signal when, Laser stealth material system 100 enter second
Acquisition mode (gas concentration measurement state), under the acquisition mode, laser reflection signal is changed into electricity by photodetector 201
After signal, the gas concentration which can be transmitted directly to signal processor calculates module 2032, signal processor
Gas concentration calculates module 2032 and calculates simultaneously output gas concentration detection result according to above-mentioned signal.
It should be noted that laser reflection signal is changed into electric signal by photodetector 201 under the second acquisition mode
Afterwards, which can also be sent to lock-in amplifier 204, by lock-in amplifier 204 to received from photodetector 201
Signal is demodulated, and the gas concentration that the signal after demodulation is sent to signal processor is calculated module 2032, signal processing
The gas concentration of device calculates module 2032 and calculates simultaneously output gas concentration detection result according to the signal after above-mentioned demodulation.Specifically
The demodulation process by lock-in amplifier whether can be needed according to the method choice electric signal of gas concentration measurement.
In embodiments of the present invention, the measurement method of gas concentration can use direct absorption process, can also use harmonic wave
Method.
Direct absorption process drives laser by delta current, so that the wavelength average rate scanning of laser output laser passes through
Tested gas absorption spectrum line analyzes signal amplitude, it is dense can to obtain gas by lifting the gas absorption signal in exploring laser light
Spend information.
Harmonic Method modulates the wavelength of laser using sinusoidal current, so that gas absorption signal can be embodied in modulating frequency
On fundamental frequency and frequency multiplication, by analyzing even harmonics signal amplitude, it can calculate and obtain gas concentration information.
In embodiments of the present invention, in step S1, trigger alternately sends the first acquisition mode trigger signal and second and visits
The following two kinds mode can be selected by surveying State triggers to signal generator：
Mode one, trigger 101 alternately send the first acquisition mode trigger signal and second according to the preset time interval
Acquisition mode trigger signal is to signal generator 102.Specifically, timer can be arranged in trigger 101, so that triggering
Device alternately sends the first acquisition mode trigger signal and the second acquisition mode trigger signal according to the preset time interval.It needs
Bright, preset time interval should meet the measurement under certain acquisition mode of the completion of Laser stealth material system 100.
Mode two, trigger 101 send first and visit after the signal for receiving laser pick-off unit output detection result
State triggers or the second acquisition mode trigger signal are surveyed to signal generator 102.Specifically, can by trigger 101 with
Laser pick-off unit 20 connects, which can send output detection when exporting detection result to trigger
As a result signal, trigger 101 receive the signal for the output detection result that laser pick-off unit 20 is sent, and are receiving the letter
After number, another acquisition mode trigger signal is sent.For example, present laser remote sensing system 100 is in the first detection shape
State (range measurement state), and laser pick-off unit 20 output range measurement as a result, laser pick-off unit 20 can at this time
To send the signal of output range measurements to trigger 101, then trigger 101 is receiving output range measurements
After signal, send the second acquisition mode trigger signal to signal generator 102 so that Laser stealth material system 100 into
Enter the second acquisition mode (gas concentration measurement state).
In embodiments of the present invention, in step S2, laser controller according to the first modulated signal to the output of laser into
Row modulation can be modulated for laser controller according to light intensity of first modulated signal to the laser that laser exports, and make
The wavelength of the laser of laser output avoids the characteristic absorption peak wavelength region of tested gas.The first above-mentioned modulated signal includes
The sine wave of at least two frequencies, to realize the measurement of absolute distance.In this way, when carrying out range measurement, laser output
The wavelength of laser will not avoid detectable signal and be actually taken up by gas and other modulated signals near the absorption peak of tested gas
Interference, ensure that the accuracy and telemeasurement of range measurement.
Specifically, being referred to following formula obtains absolute distance value,
(a*2pi+phase1)：(b*2pi+phase2)=freq1：freq2
For low frequency signal, can usually take a=0, therefore, above-mentioned formula can simplify for：
phase1：(b*2pi+phase2)=freq1：freq2
Wherein, freq1 and freq2 is respectively the frequency of the sine wave of two kinds of frequencies；
Phase1 and phase2 is phase pushing figure corresponding with freq1 and freq2, which can pass through
Phase discriminator obtains；
By determining that b can obtain absolute distance value.
In practical applications, the precision for if desired improving range measurement, then can be further added by a higher modulating frequency
Sine wave, more accurate phase delay amount can be thus obtained, to obtain more accurate absolute distance value to be measured
In embodiments of the present invention, in step S2, laser controller according to the second modulated signal to the output of laser into
Row modulation can be modulated the wavelength for the laser that laser exports according to second modulated signal for laser controller, with
So that the scanning wavelength range of the laser covers the characteristic absorption peak wavelength of tested gas.
In Laser stealth material method of the invention, trigger alternately sends the first acquisition mode trigger signal and second
Acquisition mode trigger signal to signal generator so that Laser stealth material system of the invention the first acquisition mode (away from
From measuring state) and the second acquisition mode (gas concentration measurement state) between alternately, i.e., timesharing measure by way of realize away from
From measurement and two kinds of functions of gas concentration measurement.In compared to the prior art by way of installing laser ranging system additional, this hair
It is bright that range measurement function is realized on the basis of not changing the optical frame of laser gas remote measurement device, structure is simplified, is dropped
The low cost of detection system simultaneously reduces volume.
Above description sufficiently discloses a specific embodiment of the invention.It should be pointed out that being familiar with the field
Range of any change that technical staff does a specific embodiment of the invention all without departing from claims of the present invention.
Correspondingly, the scope of the claims of the invention is also not limited only to previous embodiment.
Claims (10)
1. a kind of Laser stealth material system, including laser emission element and laser pick-off unit, the laser emission element is used
In emission detection laser, the laser pick-off unit is handled the reflection signal for receiving laser reflection signal
After export detection result, which is characterized in that
The laser emission element includes trigger, signal generator, laser controller and laser, wherein
The trigger, for sending acquisition mode trigger signal, so that the detection system is in the first acquisition mode and
Between two acquisition modes alternately, first acquisition mode is range measurement state, and second acquisition mode is gas concentration survey
Amount state；The acquisition mode trigger signal includes the first acquisition mode trigger signal and the second acquisition mode trigger signal；
The signal generator, the acquisition mode trigger signal sent for receiving the trigger, according to the acquisition mode
Trigger signal generates modulated signal, and the modulated signal is injected the laser controller, so that the laser controller
Output modulation to the laser；The modulated signal includes the first modulated signal and the second modulated signal, and described first adjusts
Signal processed is corresponding with the first acquisition mode trigger signal, and second modulated signal and second acquisition mode trigger
Signal is corresponding.
2. Laser stealth material system according to claim 1, which is characterized in that the laser controller is according to described
One modulated signal is modulated the light intensity for the laser that the laser exports, and makes the wave of the laser of the laser output
The long characteristic absorption peak wavelength region for avoiding tested gas.
3. Laser stealth material system according to claim 2, which is characterized in that first modulated signal includes at least
The sine wave of two kinds of frequencies.
4. Laser stealth material system according to claim 1, which is characterized in that the laser controller is according to described
Two modulated signals are modulated the wavelength for the laser that the laser exports, so that the scanning wavelength range of the laser
Cover the characteristic absorption peak wavelength of tested gas.
5. Laser stealth material system according to claim 1, which is characterized in that the laser emission element further includes outer
Portion's modulation crystal, the external modulation crystal are connect with the output end of the laser.
6. Laser stealth material system according to claim 1, which is characterized in that the laser pick-off unit includes photoelectricity
Detector, phase discriminator and signal processor, wherein
The photodetector is converted to electric signal for receiving laser reflection signal, and by the laser reflection signal；
The input terminal of the phase discriminator is connect with the photodetector and signal generator respectively, for visiting to from the photoelectricity
It surveys device received signal and carries out phase demodulation comparison, and the signal after comparison is sent to signal processor；
The signal processor includes distance calculation module and gas concentration computing module, the distance calculation module and the mirror
The output end of phase device connects, for being calculated according to the signal after the comparison and exporting distance measurement result；The gas concentration
Computing module, for calculating simultaneously output gas concentration detection result according to the electric signal after conversion.
7. a kind of Laser stealth material method, which is characterized in that the method includes：
Trigger alternately sends the first acquisition mode trigger signal and the second acquisition mode trigger signal to signal generator；
The signal generator receives the first acquisition mode trigger signal or the second acquisition mode trigger signal, according to described
First acquisition mode trigger signal or the second acquisition mode trigger signal generate the first modulated signal or the second modulated signal, and will
First modulated signal or the second modulated signal inject laser controller；
The laser controller modulates the output of laser according to first modulated signal or the second modulated signal.
8. Laser stealth material method according to claim 7, which is characterized in that the trigger alternately sends first and visits
It surveys State triggers and the second acquisition mode trigger signal to signal generator includes：
The trigger alternately sends the first acquisition mode trigger signal and the touching of the second acquisition mode according to the preset time interval
It signals to signal generator；Alternatively,
The trigger sends the triggering of the first acquisition mode after the signal for receiving laser pick-off unit output detection result
Signal or the second acquisition mode trigger signal are to signal generator.
9. Laser stealth material method according to claim 7, which is characterized in that the laser controller is according to described
One modulated signal or the second modulated signal include to the output modulation of laser：
The laser controller is modulated the light intensity for the laser that laser exports according to first modulated signal, and makes
The wavelength of the laser of the laser output avoids the characteristic absorption peak wavelength region of tested gas；
The laser controller is modulated the wavelength for the laser that laser exports according to second modulated signal, so that
The scanning wavelength range of the laser covers the characteristic absorption peak wavelength of tested gas.
10. Laser stealth material method according to claim 7, which is characterized in that the laser controller is according to
After first modulated signal is to the output modulation of laser, the method also includes：
Photodetector receives laser reflection signal, and the laser reflection signal is converted to electric signal；Phase discriminator is to from institute
It states photodetector received signal and carries out phase demodulation comparison, and the distance that the signal after comparison is sent to signal processor is calculated
Module；The distance calculation module of the signal processor calculates according to the signal after the comparison and exports distance measurement result；
After the laser controller modulates the output of laser according to second modulated signal, the method also includes：
Photodetector receives laser reflection signal, and the laser reflection signal is converted to electric signal；Signal processor
Gas concentration calculates module and calculates simultaneously output gas concentration detection result according to the electric signal after conversion.
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