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Laser intensity self-adaptive adjustment method for active visual measurement in turbid water

An adaptive adjustment, active vision technology, applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of optical sensor saturation, adverse effects on measurement accuracy, low signal-to-noise ratio, etc., to reduce attenuation. effect, strong practical value, and broad market prospects

Pending Publication Date: 2020-07-03
TIANJIN UNIV +1
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  • Claims
  • Application Information

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Problems solved by technology

Since the calibration of the active vision measurement system can only be carried out in water with a certain turbidity (such as zero turbidity water in the laboratory environment), when the turbidity of the water in the measurement environment is inconsistent with the calibration, it will cause Due to the saturation phenomenon of the optical sensor received by the light intensity or the low signal-to-noise ratio, it will adversely affect the measurement accuracy

Method used

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  • Laser intensity self-adaptive adjustment method for active visual measurement in turbid water
  • Laser intensity self-adaptive adjustment method for active visual measurement in turbid water
  • Laser intensity self-adaptive adjustment method for active visual measurement in turbid water

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Embodiment 1

[0073] 1) Open-loop model establishment

[0074] Semiconductor laser drive circuits such as Image 6 Shown, T las =30μs, the CCD uses a linear array CCD with a blanking time of 166μs, and the range of water turbidity is 0-100NTU, that is, the range of the laser light intensity attenuation rate N is [0.7,1].

[0075] 2) Open-loop model simplification

[0076]

[0077] 3) Design of regulator

[0078] Because the range of the laser light intensity attenuation rate N is [0.7,1], so take Regulator design requirements, take h=5, get:

[0079] τ 1 =5×30=150

[0080]

[0081] Take a=3.5, then It is strictly true.

[0082] Take γ=0.31, get According to the regulator design, the system is stable and e 1 (t)→0, that is, P CCDp →P CCDm .

[0083] When working, the difference between the reference light intensity and the actual light intensity is adjusted by the controller and applied to the transfer function of the controlled object, and the resulting light intensity...

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Abstract

The invention discloses a laser intensity self-adaptive adjustment method for active visual measurement in the turbid water. A semiconductor laser driven by a current source is provided with a laser regulator, the laser regulator comprises a reference model path and an object model passage, when the reference light intensity input added to an object model path is further added to the reference model path at the same time, parameters are changed through a light intensity adaptive algorithm set in the object model path according to the ideal laser controller parameters calculated by the reference model path, so the attenuation effect of the water turbidity in the object model path on the light intensity is counteracted, and the light intensity output of the reference model path is consistentwith the light intensity output of the object model path. The method is advantaged in that by self-adaptively adjusting light intensity of the laser, the attenuation effect of the water on the laseris reduced, a phenomenon that an optical sensor is saturated or the signal-to-noise ratio is too low due to different turbidity of water is prevented, and precision of active visual measurement in theturbid water can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of visual measurement applications, in particular to a laser light intensity self-adaptive adjustment method for active visual measurement in turbid water. Background technique [0002] Since active vision measurement has the characteristics of fast detection speed, high measurement accuracy, and strong anti-interference performance, it has been widely used in the fields of thickness measurement, 3D modeling, and mold making. [0003] An active vision measurement system usually consists of a light source, an imaging optical path, and an optical sensor. The stability of the light source directly determines the accuracy of active vision measurement. The most commonly used light source at present is the laser light source. When active vision measurement is used in turbid water, the laser light emitted by the laser will be attenuated by the water, resulting in a decrease in light intensity. The degree of turb...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
CPCG01N21/17
Inventor 王万财陈曦李彦知郭海楠韩雅桐
Owner TIANJIN UNIV