CN104897373B - Obtain the method and device of laser power and detector photoelectric current linear relationship - Google Patents
Obtain the method and device of laser power and detector photoelectric current linear relationship Download PDFInfo
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Abstract
The present invention provides a kind of method obtaining linear relationship between array laser power and detector array photoelectric current, the array is the linear arrays of N × 1, and the power is P, and the photoelectric current is C, the linear relationship is the matrix A of N × N, including step 1 opens j-th of laser, other lasers are in off state, j is 1,2,3 ... N；Step 2 measures the output power P of j-th of laserj, and the photoelectric current C of N number of detector is measured respectivelyi, i 1,2,3 ... N；Step 3 calculates jth by formula and arranges all element aij=Ci/Pj；Step 4, for the different values of j, until N number of laser was opened one by one, and matrix A is calculated in circulation step one to step 3‑1Whole element aij；Step 5, to matrix A‑1It carries out inverse operation and obtains matrix A.The matrix A obtained using this method, linear relationship that can be between truly expressed array laser power and detector array photoelectric current, even if the actual power of laser can be obtained if in the case where array laser has channel interference in.
Description
Technical field
The present invention relates to array lasers, more particularly to a kind of acquisition array laser power and detector array photoelectricity
The method and device of linear relationship between stream.
Background technology
Online array laser in use, the power to each laser is usually needed to be monitored.Due to laser
The distance between it is relatively close, and be used to monitor be typically identical quantity a linear array photodetector, these photodetections
The photoelectric current that device is read usually contains the noise information of adjoining laser stray light so that is read to each channel laser power
Generate error.In order to avoid the crosstalk of interchannel, current usual way is to seek to solve in light path design and dependency structure
Scheme.Such as lens are designed on photodetector, light bar and optical filter, but reality is relatively difficult to by hardware in structure
It is existing.
Invention content
The embodiment of the present invention be designed to provide a kind of acquisition array laser power and detector array photoelectric current it
Between linear relationship method and device, can be linear between truly expressed array laser power and detector array photoelectric current
Relationship, even if in the case where array laser has channel interference in by the way that laser can be obtained if the linear relationship
Actual power.
In view of this, an embodiment of the present invention provides a kind of acquisition array laser power and detector array photoelectric current it
Between linear relationship method, the array is the linear arrays of N × 1, and the power is P, and the photoelectric current is C, the linear pass
System is the matrix A of N × N, including：
Step 1 opens j-th of laser, other lasers are in off state, j 1,2,3 ... N；
Step 2 measures the output power P of j-th of laserj, and the photoelectric current C of N number of detector is measured respectivelyi, i
The N that is 1,2,3 ...；
Step 3 calculates jth by following equation (3) and arranges all element aij=Ci/Pj；
By formula P=AC (1)
It obtains
Turning to system of linear equations is：
Step 4, for the different values of j, circulation step one to step 3, until N number of laser was opened one by one,
And matrix A is calculated-1Whole element aij；
Step 5, to matrix A-1It carries out inverse operation and obtains matrix A.
Correspondingly, an embodiment of the present invention provides between a kind of acquisition array laser power and detector array photoelectric current
The device of linear relationship, the array are the linear arrays of N × 1, and the power is P, and the photoelectric current is C, the linear relationship
For the matrix A of N × N, including：
Opening unit, for opening j-th of laser, other lasers are in off state, j 1,2,3 ... N；
Measuring unit, the output power P for measuring j-th of laserj, and the light of N number of detector is measured respectively
Electric current Ci, i 1,2,3 ... N；
Computing unit arranges all element a for calculating jth by following equation (3)ij=Ci/Pj；
By formula P=AC (1)
It obtains
Turning to system of linear equations is：
Control unit, for for values different j, controlling the opening unit, measuring unit, computing unit circulation industrial
Make, until N number of laser was opened one by one, and matrix A is calculated-1Whole element aij；
Inverse operation unit, for matrix A-1It carries out inverse operation and obtains matrix A.
Correspondingly, an embodiment of the present invention provides a kind of sides of laser actual power in acquisition array laser use
Method, the array are the linear arrays of N × 1, including：
Open all N number of lasers；
The photoelectric current C of N number of detector is measured respectivelyi, i 1,2,3 ... N, the photoelectric current CiTo include other N-1
Photoelectric current including laser stray light；
The matrix A obtained according to claim 1 the method is obtained, each laser is calculated by formula P=AC
The actual power P of devicei。
Further, it is described obtain obtained according to claim 1 the method matrix A the step of before, further include：
Prestore the matrix A obtained according to claim 1 the method.
Correspondingly, an embodiment of the present invention provides a kind of dresses of laser actual power in acquisition array laser use
It sets, the array is the linear arrays of N × 1, including：
Opening unit, for opening all N number of lasers；
Measuring unit, the photoelectric current C for measuring N number of detector respectivelyi, i 1,2,3 ... N, the photoelectric current CiFor
Including the photoelectric current including other N-1 laser stray lights；
Computing unit for obtaining the matrix A obtained according to claim 1 the method, and is calculated by formula P=AC
Obtain the actual power P of each laseri。
Further, further include：
Storage unit, for storing the matrix A obtained according to claim 1 the method.
The matrix A obtained using this method, can truly expressed array laser power and detector array photoelectric current it
Between linear relationship, even if the practical work(of laser can be obtained if in the case where array laser has channel interference in
Rate.
Description of the drawings
Fig. 1 is the side of linear relationship between acquisition array laser power and detector array photoelectric current provided by the invention
Method embodiment flow chart；
Fig. 2 is the dress of linear relationship between acquisition array laser power and detector array photoelectric current provided by the invention
Set embodiment block diagram；
Fig. 3 is the embodiment of the method flow of laser actual power in acquisition array laser use provided by the invention
Figure；
Fig. 4 is one box of device embodiment of laser actual power in acquisition array laser use provided by the invention
Schematic diagram；
Fig. 5 is two box of device embodiment of laser actual power in acquisition array laser use provided by the invention
Schematic diagram.
Specific implementation mode
An embodiment of the present invention provides linearly closed between a kind of acquisition array laser power and detector array photoelectric current
The method of system, the array are the linear arrays of N × 1, and the power is P, and the photoelectric current is C, and the linear relationship is N × N
Matrix A.It is N number of channel side by side in concrete application, one laser of each channel and a corresponding detector are visited
The photoelectric current of the laser is surveyed to calculate its power, ensure laser power stablizes output.
Fig. 1 is the side of linear relationship between acquisition array laser power and detector array photoelectric current provided by the invention
Method embodiment flow chart, please refers to Fig.1.
101, step 1 opens j-th of laser, other lasers are in off state, j 1,2,3 ... N.
Specifically, the present embodiment by taking j=1 as an example, when other lasers are in off state, opens the 1st laser.
It is of course also possible to the 2nd is opened, the 3rd ... n-th laser.
102, step 2 measures the output power P of j-th of laserj, and the photoelectricity of N number of detector is measured respectively
Flow Ci, i 1,2,3 ... N.
Specifically, due to only opening unique 1st laser, its output power P of measurement at this time1It is accurate
Actual value；And the photoelectric current C of the N number of detector measured1、C2、C3……CNIn, C1It is detected for corresponding 1st detector
The 1st laser photoelectric current, remaining C2、C3……CNIt is the stray light for the 1st laser that other detectors detect,
The photoelectric current that i.e. each laser detects other all detectors has an impact, namely defeated to the laser of its respective channel
Go out power to have an impact.
103, step 3 calculates jth by formula and arranges all element aij=Ci/Pj。
Specifically, due to having measured output power P in step 21With photoelectric current C1、C2、C3……CN, therefore, pass through
Following formula (3) can calculate all element a of the 1st row11、a21、a31……aN1, the column element i.e. the 1st laser is to it
The impact factor of his laser.
By formula P=AC (1)
It obtains
Turning to system of linear equations is：
104, step 4, for the different values of j, circulation step one to step 3, until N number of laser is opened one by one
It crosses, and matrix A is calculated-1Whole element aij。
Specifically, calculating all element a of the 1st row according to front11、a21、a31……aN1Same procedure, for j difference
Value, such as j=2, cycle executes step 1 to step 3, all element a of the 2nd row is calculated12、a22、a32……
aN2；Likewise, j=3, cycle executes step 1 to step 3, and all element a of the 3rd row are calculated13、a23、a33……
aN3；J=4 ... ... was opened one by one until N number of laser, and matrix A is calculated-1Whole element aij。
105, step 5, to matrix A-1It carries out inverse operation and obtains matrix A.
Specifically, matrix transform operation is common knowledge, details are not described herein again.
The matrix A that the present embodiment method obtains detects other all detectors due to calculating each laser
The impact factor of photoelectric current, linear relationship that can be between truly expressed array laser power and detector array photoelectric current,
Using the matrix A, even if the practical work(of laser can be calculated if in the case where array laser has channel interference in
Rate.
Correspondingly, the embodiment of the present invention additionally provide a kind of acquisition array laser power and detector array photoelectric current it
Between linear relationship device, the array is the linear arrays of N × 1, and the power is P, and the photoelectric current is C, the linear pass
System is the matrix A of N × N.In concrete application, be N number of channel side by side, one laser of each channel and one it is corresponding
Detector detects the photoelectric current of the laser to calculate its power, and ensure laser power stablizes output.
Fig. 2 is the dress of linear relationship between acquisition array laser power and detector array photoelectric current provided by the invention
Set embodiment block diagram.It should be noted that the connecting line in the present embodiment between each component, does not necessarily represent each component
Between carry out physical connection, interrelated in logic between each component or interaction relationship can also be represented.
Referring to Fig. 2, the present embodiment provides lines between a kind of acquisition array laser power and detector array photoelectric current
The device 2 of sexual intercourse, the device 2 include opening unit 21, measuring unit 22, computing unit 23, control unit 24 and inverse fortune
Calculate unit 25.
The opening unit 21, for opening j-th of laser, other lasers are in off state, j 1,2,
3……N。
Specifically, the present embodiment by taking j=1 as an example, when other lasers are in off state, opens the 1st laser.
It is of course also possible to the 2nd is opened, the 3rd ... n-th laser.
The measuring unit 22, the output power P for measuring j-th of laserj, and N number of detection is measured respectively
The photoelectric current C of devicei, i 1,2,3 ... N.
Specifically, since the opening unit 21 at this time only opens unique 1st laser, the measurement is single
Its output power P that member 22 measures1It is accurate actual value；And the photoelectric current C of the N number of detector measured1、C2、C3……CNIn, C1
For the photoelectric current for the 1st laser that corresponding 1st detector detects, remaining C2、C3……CNIt is the detection of other detectors
The stray light of the 1st laser arrived, i.e., the photoelectric current that each laser detects other all detectors have an impact,
Have an impact to the laser output power of its respective channel.
The computing unit 23 arranges all element a for calculating jth by following equation (3)ij=Ci/Pj.Specifically
, since the measuring unit 22 has measured output power P1With photoelectric current C1、C2、C3……CN, therefore, pass through following formula
(3) all element a of the 1st row can be calculated11、a21、a31……aN1, the column element i.e. the 1st laser is to other lasers
Impact factor.
By formula P=AC (1)
It obtains
Turning to system of linear equations is：
Described control unit 24, for for values different j, controlling the opening unit, measuring unit, computing unit
Until N number of laser was opened one by one, and matrix A is calculated in cycle operation-1Whole element aij。
Specifically, described control unit 24 controls the opening unit 21, measures for values different j, such as j=2
All element a of the 2nd row are calculated in unit 22,23 cycle operation of computing unit12、a22、a32……aN2；Likewise, j=3,
The opening unit, measuring unit, computing unit cycle operation are controlled, all element a of the 3rd row are calculated13、a23、
a33……aN3；J=4 ... ... was opened one by one until N number of laser, and matrix A is calculated-1Whole element aij。
The inverse operation unit 25, for matrix A-1It carries out inverse operation and obtains matrix A.
Specifically, matrix transform operation is common knowledge, details are not described herein again.
Using the matrix A that the present embodiment device obtains, other all detectors are detected due to calculating each laser
The impact factor of the photoelectric current arrived, linear pass that can be between truly expressed array laser power and detector array photoelectric current
System, using the matrix A, even if the reality of laser can be calculated if in the case where array laser has channel interference in
Power.
Correspondingly, the embodiment of the present invention additionally provides a kind of side obtaining laser actual power in array laser use
Method, the array are the linear arrays of N × 1.It is N number of channel side by side, one laser of each channel, Yi Jiyi in concrete application
A corresponding detector detects the photoelectric current of the laser to calculate its power, and ensure laser power stablizes output.
Fig. 3 is the embodiment of the method flow of laser actual power in acquisition array laser use provided by the invention
Figure, please refers to Fig. 3.
Step 301, all N number of lasers are opened.
Specifically, being generally to open all N number of lasers simultaneously in practical applications.
Step 302, the photoelectric current C of N number of detector is measured respectivelyi, i 1,2,3 ... N, the photoelectric current CiTo include it
Photoelectric current including its N-1 laser stray light.
Specifically, since the distance between N number of laser is relatively close, and one of the typically identical quantity for being used to monitor
Linear array photodetector, the photoelectric current that these photodetectors are read usually contain the noise letter of adjoining laser stray light
Breath.
Step 303, matrix A is obtained, the actual power P of each laser is calculated by formula P=ACi。
Specifically, the method for obtaining matrix A is identical as Fig. 1 embodiments the method for the present invention.Preferably, the matrix A
It after being obtained with Fig. 1 the methods of the present invention, prestores in a register, only need to directly be adjusted after measuring photoelectric current in this step
With A, it is directly substituted into the actual power P that each laser can be calculated in formula P=ACi。
Using the present embodiment the method, other all detectors are visited due to the use of each laser had been computed
The impact factor of the photoelectric current measured, can be linear between truly expressed array laser power and detector array photoelectric current
The matrix A of relationship so that array laser is in use, even if can obtain laser by survey calculation if having channel interference
Actual power, to stablizing the output power of the laser it is helpful.
Correspondingly, the present invention also provides a kind of device of laser actual power in acquisition array laser use, institute
It is the linear arrays of N × 1 to state array.It is N number of channel side by side, one laser of each channel and a correspondence in concrete application
Detector detect the photoelectric current of the laser to calculate its power, ensure laser power stablize output.
Hereinafter laser actual power in array laser use will be obtained to provided by the invention with two embodiments
Device illustrates.It should be pointed out that the connecting line in two embodiments between each component, does not necessarily represent each component
Between carry out physical connection, interrelated in logic between each component or interaction relationship can also be represented.
Fig. 4 is one box of device embodiment of laser actual power in acquisition array laser use provided by the invention
Schematic diagram please refers to Fig. 4.
The present embodiment provides a kind of dresses of linear relationship between acquisition array laser power and detector array photoelectric current
Set 4, including：
Opening unit 41, for opening all N number of lasers.
Specifically, being generally to open all N number of lasers simultaneously in practical applications.
Measuring unit 42, the photoelectric current C for measuring N number of detector respectivelyi, i 1,2,3 ... N, the photoelectric current Ci
To include the photoelectric current including other N-1 laser stray lights.
Specifically, the measuring unit 42 is a linear array photodetector, due to the distance between N number of laser
It is relatively close, therefore the photoelectric current of these photodetectors reading usually contains the noise information of adjoining laser stray light.
For obtaining matrix A, and the actual power P of each laser is calculated by formula in computing unit 43i。
Specifically, the method for obtaining matrix A is identical as Fig. 1 embodiments the method for the present invention.Preferably, the matrix A
After being obtained with Fig. 1 the methods of the present invention, prestore in a register, 43 need of computing unit directly invoke A, are directly substituted into
The actual power P of each laser can be calculated in formula P=ACi。
Using the present embodiment the method, other all detectors are visited due to the use of each laser had been computed
The impact factor of the photoelectric current measured, can be linear between truly expressed array laser power and detector array photoelectric current
The matrix A of relationship so that array laser is in use, even if can obtain laser by survey calculation if having channel interference
Actual power, to stablizing the output power of the laser it is helpful.
Fig. 5 is two box of device embodiment of laser actual power in acquisition array laser use provided by the invention
Schematic diagram please refers to Fig. 4.
The present embodiment provides a kind of dresses of linear relationship between acquisition array laser power and detector array photoelectric current
Set 5, including：
Opening unit 51, for opening all N number of lasers.
Specifically, identical as one opening unit 41 of embodiment, details are not described herein again.
Measuring unit 52, the photoelectric current C for measuring N number of detector respectivelyi, i 1,2,3 ... N, the photoelectric current Ci
To include the photoelectric current including other N-1 laser stray lights.
Specifically, identical as one measuring unit 42 of embodiment, details are not described herein again.
Storage unit 54 is used for storage matrix A.
Specifically, the acquisition methods of the matrix A are identical as Fig. 1 embodiments the method for the present invention.
For obtaining matrix A from storage unit 54, and each laser is calculated by formula in computing unit 53
Actual power Pi。
Specifically, identical as one computing unit 43 of embodiment, details are not described herein again.
Using the present embodiment the method, other all detectors are visited due to the use of each laser had been computed
The impact factor of the photoelectric current measured, can be linear between truly expressed array laser power and detector array photoelectric current
The matrix A of relationship so that array laser is in use, even if can obtain laser by survey calculation if having channel interference
Actual power, to stablizing the output power of the laser it is helpful.
It is provided for the embodiments of the invention above and obtains line between array laser power and detector array photoelectric current
The method and device of laser actual power has carried out in detail in the method and device of sexual intercourse, and acquisition array laser use
Thin to introduce, principle and implementation of the present invention are described for two specific cases used herein, above example
Explanation be merely used to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (6)
1. a kind of method obtaining linear relationship between array laser power and detector array photoelectric current, the array are
The linear arrays of N × 1, the power are P, and the photoelectric current is C, and the linear relationship is the matrix A of N × N, which is characterized in that packet
It includes：
Step 1 opens j-th of laser, other lasers are in off state, j 1,2,3 ... N；
Step 2 measures the output power P of j-th of laserj, and the photoelectric current C of N number of detector is measured respectivelyi, i 1,
2,3……N；
Step 3 calculates jth by following equation (3) and arranges all element aij=Ci/Pj；
By formula P=AC (1)
It obtains
Turning to system of linear equations is：
Step 4, for the different values of j, circulation step one to step 3 until N number of laser was opened one by one, and is counted
Calculation obtains matrix A-1Whole element aij；
Step 5, to matrix A-1It carries out inverse operation and obtains matrix A.
2. a kind of device obtaining linear relationship between array laser power and detector array photoelectric current, the array are
The linear arrays of N × 1, the power are P, and the photoelectric current is C, and the linear relationship is the matrix A of N × N, which is characterized in that packet
It includes：
Opening unit, for opening j-th of laser, other lasers are in off state, j 1,2,3 ... N；
Measuring unit, the output power P for measuring j-th of laserj, and the photoelectric current of N number of detector is measured respectively
Ci, i 1,2,3 ... N；
Computing unit arranges all element a for calculating jth by following equation (3)ij=Ci/Pj；
By formula P=AC (1)
It obtains
Turning to system of linear equations is：
Control unit, for for values different j, controlling the opening unit, measuring unit, computing unit cycle operation,
Until N number of laser was opened one by one, and matrix A is calculated-1Whole element aij；
Inverse operation unit, for matrix A-1It carries out inverse operation and obtains matrix A.
3. a kind of method obtaining laser actual power in array laser use, the array is the linear arrays of N × 1, special
Sign is, including：
Open all N number of lasers；
The photoelectric current C of N number of detector is measured respectivelyi, i 1,2,3 ... N, the photoelectric current CiTo include other N-1 laser
Photoelectric current including device stray light；
The matrix A obtained according to claim 1 the method is obtained, each laser is calculated by formula P=AC
Actual power Pi。
4. according to the method described in claim 3, it is characterized in that, being obtained according to claim 1 the method in described obtain
Matrix A the step of before, further include：
Prestore the matrix A obtained according to claim 1 the method.
5. a kind of device obtaining laser actual power in array laser use, the array is the linear arrays of N × 1, special
Sign is, including：
Opening unit, for opening all N number of lasers；
Measuring unit, the photoelectric current C for measuring N number of detector respectivelyi, i 1,2,3 ... N, the photoelectric current CiFor comprising
Photoelectric current including other N-1 laser stray lights；
Computing unit for obtaining the matrix A obtained according to claim 1 the method, and is calculated by formula P=AC
The actual power P of each laseri。
6. device according to claim 5, which is characterized in that further include：
Storage unit, for storing the matrix A obtained according to claim 1 the method.
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