CN106769730B - The autonomous modification method of laser diode power - Google Patents
The autonomous modification method of laser diode power Download PDFInfo
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
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Abstract
The invention discloses a kind of autonomous modification method of laser diode power, comprising: step (1): concavees lens, the first photoelectric receiving tube are set gradually in the optical path of laser；Step (2): the second photoelectric receiving tube, third photoelectric receiving tube is arranged in the two sides interval of the first photoelectric receiving tube；Step (3): optical power P1, optical power P2, optical power P3 are calculated；Step (4): record decaying optical power Pr1, decaying optical power Pr2, decaying optical power Pr3；Step (5): the attenuation coefficient of the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube is calculated；Step (6): the concentration of the first photoelectric receiving tube, the second photoelectric receiving tube, each self-test of third photoelectric receiving tube is calculated；Step (7): the first photoelectric receiving tube, the second photoelectric receiving tube, the respective detection correction value of third photoelectric receiving tube are calculated；Step (8): average detected correction value is calculated.The invention is easy to operate, accuracy with higher.
Description
Technical field
The invention is related to laser diode techniques field more particularly to a kind of laser diode power independently side of amendment
Method.
Background technique
In existing laser diode use process, laser diode is influenced by itself service life, is passing through one
After the use of section time, output power will appear a degree of decaying, carry out detection work using laser diode at this time
When making, influenced by output power decaying, detection data can have certain error.
But the correction means of existing laser diode power mostly uses the circuit for changing laser diode input terminal, from
And increase the input power of laser diode to be modified, and the method does not have theoretical foundation support, after increasing input power,
When cannot hold, and then be detected to the output power of laser diode, it is easy to appear large error, is declined for power
It is not good enough to subtract correction effect.
Summary of the invention
It is an object of the present invention to a kind of autonomous modification method of laser diode power, this method operation sides
Just, cooperated without complicated device, also do not need artificial assistance, it is thus only necessary to which processing module is calculating the dense of object to be detected
When angle value, while the power of laser diode is detected, this method practicability is higher, and use cost is low, strong operability, after amendment
Data accuracy with higher.
The above-mentioned purpose of the invention is achieved by the following technical programs.
A kind of autonomous modification method of laser diode power, the described method comprises the following steps:
Step (1): concavees lens, the first photoelectric receiving tube are set gradually in the optical path of laser diode transmitting laser；
Step (2): the two sides of first photoelectric receiving tube are respectively separated the second photoelectric receiving tube of setting, third photoelectricity connects
Closed tube, first photoelectric receiving tube, second photoelectric receiving tube, the third photoelectric receiving tube orientation with it is described
The optical path that laser diode emits laser is vertical；
Step (3): it after the laser diode is opened, is connect using first photoelectric receiving tube, second photoelectricity
Closed tube, the third photoelectric receiving tube receive the laser scattered by the concavees lens that the laser diode issues, and pass through
Processing module calculates the optical power P1 that first photoelectric receiving tube detects, and second photoelectric receiving tube detects to obtain
Optical power P2, the optical power P3 that the third photoelectric receiving tube detects；
Step (4): when the processing module calculates first photoelectric receiving tube, second photoelectric receiving tube, described
When the optical power that third photoelectric receiving tube detects starts to reduce, the decaying that first photoelectric receiving tube detects is recorded
Optical power Pr1, the decaying optical power Pr2 that second photoelectric receiving tube detects, the third photoelectric receiving tube detect
The decaying optical power Pr3 arrived；
Step (5): first photoelectric receiving tube, second photoelectric receiving tube, institute are calculated by the processing module
The attenuation coefficient that each self-test of third photoelectric receiving tube obtains is stated, the attenuation coefficient of first photoelectric receiving tube is denoted as K1,
The attenuation coefficient of second photoelectric receiving tube is denoted as K2, and the attenuation coefficient of the third photoelectric receiving tube is denoted as K3, K1=
Pr1/P1, K2=Pr2/P2, K3=Pr3/P3；
Step (6): first photoelectric receiving tube, second photoelectric receiving tube, institute are calculated by the processing module
The concentration for the object to be detected that each self-test of third photoelectric receiving tube obtains is stated, first photoelectric receiving tube detects to be checked
The concentration for surveying object is PMr1, and the concentration for the object to be detected that second photoelectric receiving tube detects is PMr2, the third light
The concentration for the object to be detected that electric reception pipe detects is PMr3；
Step (7): first photoelectric receiving tube, second photoelectric receiving tube, institute are calculated by the processing module
The detection correction value of the concentration for the object to be detected that each self-test of third photoelectric receiving tube obtains is stated, first photoelectric receiving tube
Detecting correction value is PMc1, PMc1=PMr1/K1, and the detection correction value of second photoelectric receiving tube is PMc2, PMc2=
PMr2/K2, the detection correction value of the third photoelectric receiving tube are PMc3, PMc3=PMr3/K3；
Step (8): average detected correction value is calculated by the processing module, the average detected correction value is denoted as
PMc0, PMc0=(PMc1+PMc2+PMc3)/3.
The laser that the laser diode issues is scattered by the present invention by the concavees lens, then by first light
Electric reception pipe, second photoelectric receiving tube, the third photoelectric receiving tube receive the process institute that the laser diode issues
The laser of concavees lens scattering is stated, and first photoelectric receiving tube, second photoelectricity are recorded by the processing module respectively
The optical power for the laser that reception pipe, the third photoelectric receiving tube receive, when the laser diode just comes into operation, i.e.,
When the laser diode normally can steadily work, the optical power P1 that first photoelectric receiving tube detects, institute
The optical power P2 for stating that the second photoelectric receiving tube detects, the optical power P3 that the third photoelectric receiving tube detects can
The corresponding laser diode be in normal operating conditions, and work as first photoelectric receiving tube, second photoelectric receiving tube,
When the optical power for the laser that the third photoelectric receiving tube receives is begun to decline, at this time since the concavees lens are to the shadow of laser
Sound is fixed, therefore represents the laser diode at this time after use after a period of time, enters power attenuation state,
It should start progress power at this time independently to correct, the processing module records the decaying light that first photoelectric receiving tube detects
Power P r1, the decaying optical power Pr2 that second photoelectric receiving tube detects, the third photoelectric receiving tube detect to obtain
Decaying optical power Pr3, the influence due to the concavees lens to laser be it is fixed, the concavees lens will not be to described
The decaying of laser diode impacts, and the attenuation coefficient of first photoelectric receiving tube is K1, second photoelectric receiving tube
Attenuation coefficient be K2, the attenuation coefficient of the third photoelectric receiving tube is K3, K1=Pr1/P1, K2=Pr2/P2, K3=
Pr3/P3, and when laser diode decaying, the concentration for the object to be detected that first photoelectric receiving tube detects is
PMr1, the concentration for the object to be detected that second photoelectric receiving tube detects are PMr2, the third photoelectric receiving tube detection
The concentration of obtained object to be detected is PMr3, and the numerical value of PMr1/PMc1, PMr2/PMc2, PMr3/PMc3 and respective decaying
Coefficient is also identical, i.e. PMr1/PMc1=Pr1/P1, PMr2/PMc2=Pr2/P2, PMr3/PMc3=Pr3/P3；Therefore described the
The detection correction value PMc1=PMr1/K1 of one photoelectric receiving tube, the detection correction value PMc2=of second photoelectric receiving tube
PMr2/K2, the detection correction value PMc3=PMr3/K3 of the third photoelectric receiving tube；It is final to be subtracted using the method being averaged
It is small, it obtains average detected correction value PMc0, PMc0=(PMc1+PMc2+PMc3)/3, to reduce the error being randomly generated；Benefit
The laser diode is received with first photoelectric receiving tube, second photoelectric receiving tube, the third photoelectric receiving tube
The laser of sending scattered by the concavees lens obtains first photoelectric receiving tube, described the by the processing module
Two photoelectric receiving tubes, the corresponding attenuation coefficient of the third photoelectric receiving tube, then attenuation correction is carried out by formula；This method behaviour
Facilitate, cooperated without complicated device, also do not need artificial assistance, it is thus only necessary to which the processing module is described in the calculating
When the concentration value of object to be detected, while the power of the laser diode being detected, this method practicability is higher, and use cost is low,
Strong operability, revised data accuracy with higher.
Preferably, second photoelectric receiving tube, institute is respectively set in place at equal intervals for the two sides of first photoelectric receiving tube
State third photoelectric receiving tube；
First photoelectric receiving tube is arranged in second photoelectric receiving tube, the third photoelectric receiving tube at equal intervals
Two sides, first photoelectric receiving tube, second photoelectric receiving tube, the third opto-electronic receiver can be made as much as possible
The laser situation by scattering that pipe receives is close, reduces error.
Specifically, the object to be detected is the gas or little particle in air environment.
Specifically, the laser diode, the concavees lens, first photoelectric receiving tube orientation with it is described recessed
The key light overlapping of axles of lens；
First photoelectric receiving tube can receive the laser without concavees lens scattering, to reduce error.
Specifically, first photoelectric receiving tube, second photoelectric receiving tube, the third photoelectric receiving tube receive institute
After stating laser, optical power signals are converted into power electric signal using photoelectric conversion circuit, recycle the photoelectric conversion circuit
The power electric signal is sent to the processing module.
Specifically, first photoelectric receiving tube, second photoelectric receiving tube, the third photoelectric receiving tube receive institute
After stating the laser scattered in laser, scattering electric signal is converted optical signals to using photoelectric conversion circuit, described in recycling
The scattering electric signal is sent to the processing module by photoelectric conversion circuit.
Preferably, in the step (3), after the laser diode starting, the processing module real-time continuous calculates institute
The optical power that the first photoelectric receiving tube, second photoelectric receiving tube, the third photoelectric receiving tube detect is stated, when described
The optical power that first photoelectric receiving tube, second photoelectric receiving tube, the third photoelectric receiving tube detect tends towards stability
When, then assert that the laser diode enters stable state, first photoelectric receiving tube under start recording stable state, institute
State the second photoelectric receiving tube, the optical power that the third photoelectric receiving tube detects, i.e. P1, P2, P3；
When laser diode starting, due to just starting, the power of the laser diode may wave
It is dynamic, therefore, it need to remain stable to the power of the laser diode, i.e., after the described laser diode enters stable state, note
The power under stable state is recorded, can guarantee the accuracy of data.
Further, the method also includes step (9): when K1, K2, K3 any two are less than 60%, the processing
Module identifies that the laser diode is in abnormality；
When the attenuation coefficient is less than 60%, the laser diode is then in abnormality, and staff can carry out
Replacement or maintenance work, to guarantee being normally carried out for follow-up work.
Compared with prior art, the invention beneficial effect is:
1, the invention obtains signal using the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube,
Attenuation coefficient is obtained by processing module, attenuation correction is carried out by formula；This method is easy to operate, without complicated device into
Row cooperation, does not need artificial assistance yet, it is thus only necessary to which processing module detects laser when calculating the concentration value of object to be detected
The power of diode, this method practicability is higher, and use cost is low, strong operability, revised data standard with higher
True property.
2, the processing module of the invention calculates attenuation coefficient, when attenuation coefficient is less than 60%, laser diode
Then it not can avoid yet and final detection result impacted even if making up error by independently correcting in abnormality, this
When staff can replace or maintenance work, to guarantee being normally carried out for follow-up work.
Detailed description of the invention
Fig. 1 is the flow diagram of the autonomous modification method of laser diode power of embodiment 1.
Fig. 2 is the flow diagram of the autonomous modification method of laser diode power of embodiment 2.
Specific embodiment
Clear, complete description is carried out below with reference to technical solution of the attached drawing to each embodiment of the invention, it is clear that
Described embodiment is only a part of the embodiment of the invention, instead of all the embodiments.It is created based on the present invention
The embodiment made, those of ordinary skill in the art's obtained all other implementation without making creative work
Example, belongs to the range that the invention is protected.
In the description of the invention, it should be noted that term " center ", "lower", "left", "right", " is erected at "upper"
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the invention and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limitation to the invention.In addition, term " the
One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the invention.
The invention is described in further detail below through specific implementation examples and in conjunction with the accompanying drawings.
Embodiment 1
As shown in Figure 1, a kind of autonomous modification method of laser diode power, specifically includes the following steps: step (1):
Concavees lens, the first photoelectric receiving tube are set gradually in the optical path of laser diode transmitting laser；Step (2): the first opto-electronic receiver
The two sides of pipe are respectively separated setting the second photoelectric receiving tube, third photoelectric receiving tube, the first photoelectric receiving tube, the second opto-electronic receiver
Pipe, the orientation of third photoelectric receiving tube are vertical with the laser diode transmitting optical path of laser；Step (3): when two pole of laser
After pipe is opened, receive what laser diode issued using the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube
By the laser that concavees lens scatter, the optical power P1 for calculating that the first photoelectric receiving tube detects by processing module, second
The optical power P2 that photoelectric receiving tube detects, the optical power P3 that third photoelectric receiving tube detects；Step (4): work as processing
Module calculates the optical power that the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube detect and starts to reduce
When, the decaying optical power Pr1 that the first photoelectric receiving tube of record detects, the decaying light function that the second photoelectric receiving tube detects
Rate Pr2, the decaying optical power Pr3 that third photoelectric receiving tube detects；Step (5): the first photoelectricity is calculated by processing module
The attenuation coefficient that reception pipe, the second photoelectric receiving tube, each self-test of third photoelectric receiving tube obtain, by the first photoelectric receiving tube
Attenuation coefficient is denoted as K1, and the attenuation coefficient of the second photoelectric receiving tube is denoted as K2, and the attenuation coefficient of third photoelectric receiving tube is denoted as K3,
K1=Pr1/P1, K2=Pr2/P2, K3=Pr3/P3；Step (6): the first photoelectric receiving tube, second are calculated by processing module
The concentration for the object to be detected that photoelectric receiving tube, each self-test of third photoelectric receiving tube obtain, the first photoelectric receiving tube detect to obtain
The concentration of object to be detected be PMr1, the concentration of the object to be detected that the second photoelectric receiving tube detects is PMr2, third photoelectricity
The concentration for the object to be detected that reception pipe detects is PMr3；Step (7): by processing module calculate the first photoelectric receiving tube,
The detection correction value of the concentration for the object to be detected that second photoelectric receiving tube, each self-test of third photoelectric receiving tube obtain, the first light
The detection correction value of electric reception pipe is that the detection correction value of PMc1, PMc1=PMr1/K1, the second photoelectric receiving tube is PMc2,
PMc2=PMr2/K2, the detection correction value of third photoelectric receiving tube are PMc3, PMc3=PMr3/K3；Step (8): pass through processing
Module calculates average detected correction value, and average detected correction value is denoted as PMc0, PMc0=(PMc1+PMc2+PMc3)/3；Wherein,
Object to be detected is gas or little particle in air environment.
The laser that laser diode issues is scattered by the present invention by concavees lens, then by the first photoelectric receiving tube,
Two photoelectric receiving tubes, third photoelectric receiving tube receive the laser scattered by concavees lens that laser diode issues, and pass through place
Reason module records the light function for the laser that the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube receive respectively
Rate, when laser diode just comes into operation, i.e., when laser diode normally can steadily work, the first photoelectric receiving tube
Obtained optical power P1, the optical power P2 that the second photoelectric receiving tube detects are detected, third photoelectric receiving tube detects
Optical power P3 can correspond to laser diode and be in normal operating conditions, and when the first photoelectric receiving tube, the second opto-electronic receiver
When the optical power for the laser that pipe, third photoelectric receiving tube receive is begun to decline, the influence due to concavees lens to laser at this time is
Fixed, therefore laser diode is represented at this time after use after a period of time, power attenuation state is entered, should be opened at this time
Beginning carries out power and independently corrects, and processing module records the decaying optical power Pr1 that the first photoelectric receiving tube detects, the second photoelectricity
The decaying optical power Pr2 that reception pipe detects, the decaying optical power Pr3 that third photoelectric receiving tube detects, due to recessed
Influence of the mirror to laser is fixed, therefore concavees lens will not impact the power attenuation of laser diode itself, the
The attenuation coefficient of one photoelectric receiving tube is K1, and the attenuation coefficient of the second photoelectric receiving tube is K2, the decaying of third photoelectric receiving tube
Coefficient is K3, K1=Pr1/P1, K2=Pr2/P2, K3=Pr3/P3, and when laser diode decaying, the inspection of the first photoelectric receiving tube
The concentration of the object to be detected measured is PMr1, and the concentration for the object to be detected that the second photoelectric receiving tube detects is PMr2, the
The concentration for the object to be detected that three photoelectric receiving tubes detect is PMr3, and PMr1/PMc1, PMr2/PMc2, PMr3/PMc3
Numerical value and respective attenuation coefficient are also identical, i.e. PMr1/PMc1=Pr1/P1, PMr2/PMc2=Pr2/P2, PMr3/PMc3=
Pr3/P3；Therefore the detection correction value PMc1=PMr1/K1 of the first photoelectric receiving tube, the detection correction value of the second photoelectric receiving tube
PMc2=PMr2/K2, the detection correction value PMc3=PMr3/K3 of third photoelectric receiving tube；It is final to utilize the method being averaged
Reduce, obtain average detected correction value PMc0, PMc0=(PMc1+PMc2+PMc3)/3, to reduce the error being randomly generated；
Using the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube receive laser diode issue by recessed
It is corresponding to obtain the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube by processing module for the laser of mirror scattering
Attenuation coefficient, then attenuation correction is carried out by formula；This method is easy to operate, is cooperated without complicated device, also not
Need artificial assistance, it is thus only necessary to which processing module detects the function of laser diode when calculating the concentration value of object to be detected
Rate, this method practicability is higher, and use cost is low, strong operability, revised data accuracy with higher.
Wherein, the laser that laser diode issues is scattered by concavees lens, when concavees lens are scattered laser, can be made
At the decaying of laser energy, and the attenuation degree of laser energy and by the distance dependent inside concavees lens, due in concavees lens
Portion's thickness is relatively narrow, therefore can be considered that concavees lens are identical to the attenuation degree of laser energy, therefore works as laser diode normal use
When, the laser power after scattering is that the normal power of laser diode subtracts concavees lens to the attenuation value of power, and works as
When the power of laser diode starts decaying, the laser power after scattering is that the decay power of laser diode subtracts concavees lens pair
The attenuation value of power, therefore when the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube receive two pole of laser
When the laser scattered by concavees lens that pipe issues, the laser diode power detected and the laser diode detected decline
Subtract power to remove outside laser diode own power influence of fading, there are also decaying caused by concavees lens, and decline caused by concavees lens
Approximate fixation can be considered as by subtracting degree.
Preferably, the second photoelectric receiving tube is respectively set in place at equal intervals, third photoelectricity connects for the two sides of the first photoelectric receiving tube
Closed tube；
Second photoelectric receiving tube, third photoelectric receiving tube are arranged in the two sides of the first photoelectric receiving tube at equal intervals, when sharp
For light after concavees lens scatter, the second photoelectric receiving tube, third photoelectric receiving tube can receive laser, the second opto-electronic receiver
The air conditions of the azimuthal symmetry of pipe, third photoelectric receiving tube, surrounding are approximate, and the concentration with detectable substance is also approximate, and can use up can
Energy ground makes the laser feelings by scattering that the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube receive
Condition is close, reduces error.
In the present embodiment, laser diode, concavees lens, the orientation of the first photoelectric receiving tube and concavees lens primary optical axis
It is overlapped；
First photoelectric receiving tube can receive the laser without concavees lens scattering, to reduce error.
In the present embodiment, after the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube receive laser, benefit
Optical power signals are converted into power electric signal with photoelectric conversion circuit, photoelectric conversion circuit is recycled to send power electric signal
To processing module.
In the present embodiment, the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube receive to be occurred in laser
After the laser of scattering, scattering electric signal is converted optical signals to using photoelectric conversion circuit, recycles photoelectric conversion circuit that will dissipate
Electric signal is sent to processing module.
In the step of the present embodiment (3), after laser diode starting, processing module real-time continuous calculates the first opto-electronic receiver
The optical power that pipe, the second photoelectric receiving tube, third photoelectric receiving tube detect, when the first photoelectric receiving tube, the second photoelectricity connect
When the optical power that closed tube, third photoelectric receiving tube detect tends towards stability, then assert that laser diode enters stable state, opens
Begin to record the light function that the first photoelectric receiving tube, the second photoelectric receiving tube, third photoelectric receiving tube under stable state detect
Rate, i.e. P1, P2, P3；
When laser diode starting, due to just starting, the power of laser diode may be fluctuated, therefore,
It need to remain stable to the power of laser diode, i.e., after laser diode enters stable state, record the function under stable state
Rate can guarantee the accuracy of data.
Embodiment 2
As shown in Fig. 2, the present embodiment provides a kind of autonomous modification methods of laser diode power, the difference with embodiment 1
It is, the autonomous modification method of this laser diode power further includes step (9): when K1, K2, K3 any two are less than 60%,
Processing module identification laser diode is in abnormality；
Processing module calculates attenuation coefficient, and when attenuation coefficient is less than 60%, laser diode is then in abnormality,
Even if making up error by independently correcting, it not can avoid yet and final detection result impacted, staff can be at this time
Row replacement or maintenance work, to guarantee being normally carried out for follow-up work.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the invention, rather than its limitations；
Although the invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to some or all of the technical features
It is equivalently replaced；And these are modified or replaceed, the invention embodiment that it does not separate the essence of the corresponding technical solution
Technical solution.
Claims (8)
1. a kind of autonomous modification method of laser diode power, which comprises step (1): swashing in laser diode transmitting
Concavees lens, the first photoelectric receiving tube are set gradually in the optical path of light；It is characterized in that, the method also includes following steps:
Step (2): the two sides of first photoelectric receiving tube are respectively separated setting the second photoelectric receiving tube, third opto-electronic receiver
The orientation of pipe, first photoelectric receiving tube, second photoelectric receiving tube, the third photoelectric receiving tube swashs with described
The optical path that optical diode emits laser is vertical；
Step (3): when the laser diode open after, using first photoelectric receiving tube, second photoelectric receiving tube,
The third photoelectric receiving tube receives the laser scattered by the concavees lens that the laser diode issues, by handling mould
Block calculates the optical power P1 that first photoelectric receiving tube detects, the light function that second photoelectric receiving tube detects
Rate P2, the optical power P3 that the third photoelectric receiving tube detects；
Step (4): when the processing module calculates first photoelectric receiving tube, second photoelectric receiving tube, the third
When the optical power that photoelectric receiving tube detects starts to reduce, the decaying light function that first photoelectric receiving tube detects is recorded
Rate Pr1, the decaying optical power Pr2 that second photoelectric receiving tube detects, what the third photoelectric receiving tube detected
Decay optical power Pr3；
Step (5): first photoelectric receiving tube, second photoelectric receiving tube, described the are calculated by the processing module
The attenuation coefficient of first photoelectric receiving tube is denoted as K1 by the attenuation coefficient that each self-test of three photoelectric receiving tubes obtains, described
The attenuation coefficient of second photoelectric receiving tube is denoted as K2, and the attenuation coefficient of the third photoelectric receiving tube is denoted as K3, K1=Pr1/P1,
K2=Pr2/P2, K3=Pr3/P3；
Step (6): first photoelectric receiving tube, second photoelectric receiving tube, described the are calculated by the processing module
The concentration for the object to be detected that each self-test of three photoelectric receiving tubes obtains, the object to be detected that first photoelectric receiving tube detects
Concentration be PMr1, the concentration of the object to be detected that second photoelectric receiving tube detects is PMr2, and the third photoelectricity connects
The concentration for the object to be detected that closed tube detects is PMr3；
Step (7): first photoelectric receiving tube, second photoelectric receiving tube, described the are calculated by the processing module
The detection correction value of the concentration for the object to be detected that each self-test of three photoelectric receiving tubes obtains, the detection of first photoelectric receiving tube
Correction value is PMc1, PMc1=PMr1/K1, and the detection correction value of second photoelectric receiving tube is PMc2, PMc2=PMr2/
K2, the detection correction value of the third photoelectric receiving tube are PMc3, PMc3=PMr3/K3；
Step (8): calculating average detected correction value by the processing module, and the average detected correction value is denoted as PMc0,
PMc0=(PMc1+PMc2+PMc3)/3.
2. the autonomous modification method of laser diode power according to claim 1, which is characterized in that first photoelectricity connects
Second photoelectric receiving tube, the third photoelectric receiving tube is respectively set in place at equal intervals for the two sides of closed tube.
3. the autonomous modification method of laser diode power according to claim 1, which is characterized in that the object to be detected is
Gas or little particle in air environment.
4. the autonomous modification method of laser diode power according to claim 1, which is characterized in that two pole of laser
The orientation and the key light overlapping of axles of the concavees lens of pipe, the concavees lens, first photoelectric receiving tube.
5. the application method of the autonomous modification method of laser diode power according to claim 1, which is characterized in that described
After first photoelectric receiving tube, second photoelectric receiving tube, the third photoelectric receiving tube receive the laser, turned using photoelectricity
Change circuit and optical power signals are converted into power electric signal, the photoelectric conversion circuit is recycled to send the power electric signal
To the processing module.
6. the application method of the autonomous modification method of laser diode power according to claim 1, which is characterized in that described
First photoelectric receiving tube, second photoelectric receiving tube, the third photoelectric receiving tube receive to be scattered in the laser
After laser, scattering electric signal is converted optical signals to using photoelectric conversion circuit, recycles the photoelectric conversion circuit described
Scattering electric signal is sent to the processing module.
7. the application method of the autonomous modification method of laser diode power according to claim 1, which is characterized in that described
In step (3), after the laser diode starting, the processing module real-time continuous calculates first photoelectric receiving tube, institute
The second photoelectric receiving tube is stated, the optical power that the third photoelectric receiving tube detects, when first photoelectric receiving tube, described
When the optical power that second photoelectric receiving tube, the third photoelectric receiving tube detect tends towards stability, then the laser two is assert
Pole pipe enters stable state, first photoelectric receiving tube, second photoelectric receiving tube, institute under start recording stable state
State the optical power that third photoelectric receiving tube detects, i.e. P1, P2, P3.
8. the application method of the autonomous modification method of laser diode power according to claim 1, which is characterized in that described
Method further includes step (9): when K1, K2, K3 any two are less than 60%, the processing module identifies the laser diode
In abnormality.
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