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Laser Diode Power Attenuation Correction Method

A technology of laser diode and power attenuation, which is applied in the direction of material analysis, suspension and porous material analysis, and instrumentation by optical means. It can solve the problems of no theoretical basis, prone to large errors, and output power attenuation. The effect of strong operability, low cost of use and high accuracy

Active Publication Date: 2020-10-02
武汉市普瑞思高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the use of existing laser diodes, the laser diode is affected by its own service life. After a period of use, its output power will attenuate to a certain extent. At this time, when the laser diode is used for detection work, it is affected by the output Due to the influence of power attenuation, there will be some errors in the detection data
[0003] However, the existing laser diode power attenuation correction methods mostly use changing the circuit at the input end of the laser diode to increase the input power of the laser diode for correction. This method has no theoretical support. After increasing the input power, the laser diode cannot be adjusted. The output power is grasped, and when it is detected, it is prone to large errors, and the effect of power attenuation correction is not good.

Method used

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Embodiment 1

[0032] Such as figure 1 As shown, a laser diode power attenuation correction method, the method includes:

[0033] Step (1): sequentially arrange a first photoelectric receiving tube and a second photoelectric receiving tube on the optical path where the laser diode emits laser light;

[0034] Step (2): Utilize the first photoelectric receiving tube to receive the laser light emitted by the laser diode, and the processing module calculates the power in the steady state after the laser diode is started, which is denoted as Pn;

[0035] Step (3): Utilize the second photoelectric receiving tube to receive scattered laser light from the laser light emitted by the laser diode, and the processing module calculates and obtains the concentration value of the substance to be detected, which is denoted as PMn;

[0036] Step (4): When the processing module recognizes that the power of the laser diode has attenuated, record the power in the attenuated state as Pr;

[0037] Step (5): Rec...

Embodiment 2

[0050] Such as figure 2 As shown, this embodiment provides a laser diode power attenuation correction method, the difference from embodiment 1 is that the method also includes step (8): when the attenuation coefficient is less than 50%, the processing module identifies that the laser diode is in an abnormal state;

[0051] When the attenuation coefficient is less than 50%, the laser diode is in an abnormal state. At this time, the laser diode cannot work normally. Even if it is corrected by means of correction, there is still a problem of large error. The staff needs to replace or repair it to ensure The follow-up work is carried out normally.

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Abstract

The invention discloses a laser diode power attenuation correction method, which includes: step (1): sequentially setting a first photoelectric receiving tube and a second photoelectric receiving tube on the optical path of the laser diode emitting laser; step (2): processing module calculation After the laser diode is started, the power in the steady state is recorded as Pn; Step (3): The processing module calculates the concentration value of the substance to be detected, recorded as PMn; Step (4): The power in the attenuated state is recorded as Pr; Step (5): Record the concentration value of the substance to be detected in the attenuation state, recorded as PMr; Step (6): Obtain the attenuation coefficient, recorded as K, and the calculation equation of the attenuation coefficient is K=Pr / Pn ; Step (7): Obtain the detection correction value. The detection correction value is recorded as PMc. The calculation equation of the PM detection correction value is PMc=PMr / K. The present invention does not require complicated devices for coordination, the method has high practicability, and the corrected data has high accuracy.

Description

technical field [0001] The invention relates to the technical field of laser diodes, in particular to a laser diode power attenuation correction method. Background technique [0002] During the use of existing laser diodes, the laser diode is affected by its own service life. After a period of use, its output power will attenuate to a certain extent. At this time, when the laser diode is used for detection work, it is affected by the output Due to the influence of power attenuation, there will be some errors in the detection data. [0003] However, the existing laser diode power attenuation correction method mostly adopts changing the circuit at the input end of the laser diode, thereby increasing the input power of the laser diode for correction. This method has no theoretical support. After increasing the input power, the laser diode cannot When the output power is grasped and then detected, large errors are prone to occur, and the effect of power attenuation correction i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/06G01N21/53G01N21/01
CPCG01N15/06G01N21/01G01N21/53G01N2021/0112G01N15/075
Inventor 袁俊俊陈行
Owner 武汉市普瑞思高科技有限公司