High-precision real-time laser triangulation method and triangulation device for liquid level

A technology of laser triangulation and laser triangulation, which is used in measurement devices, liquid/fluid solid measurement, lubrication indicating devices, etc., can solve the problems of low measurement accuracy and inability to realize real-time measurement, and achieve a large measurement range, good linearity and precision. high effect

Inactive Publication Date: 2012-04-18
CHANGCHUN UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The invention discloses a liquid level high-precision real-time laser triangulation measurement method t

Method used

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  • High-precision real-time laser triangulation method and triangulation device for liquid level
  • High-precision real-time laser triangulation method and triangulation device for liquid level
  • High-precision real-time laser triangulation method and triangulation device for liquid level

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Embodiment 1

[0030] Such as figure 1 Shown: laser triangular displacement sensor 11 of the present invention comprises laser device 1, convergent lens 2, receiving objective lens 3, CCD 4; After 3, it is imaged on the CCD4; the liquid level changes from the first state liquid level F1 to the second state liquid level F2; using the proportional relationship of each side of the triangle, the displacement formula is calculated and derived as follows:

[0031]

[0032] In the above formula:

[0033] a is the distance from the intersection of the optical axis of the laser beam and the receiving optical axis to the front main surface of the receiving lens;

[0034] b is the distance from the main surface of the receiving lens to the center of the imaging surface;

[0035] is the angle between the optical axis of the laser beam and the optical axis of the receiving lens;

[0036] is the angle between the detector and the optical axis of the receiving lens.

[0037] The time domain sig...

Embodiment 2

[0045] Such as figure 1 , figure 2 Shown: the present invention is made of laser triangular displacement sensor 11, outdoor liquid-taking test tube 12, indoor liquid-taking test tube 13, U-shaped tube 14, indoor liquid-taking funnel 15, signal line 16; indoor liquid-taking test tube 13 and outdoor liquid-taking test tube 12 is fixedly installed on the detection workbench; the indoor liquid-taking test tube 13 is connected with the outdoor liquid-taking test tube 12 with a U-shaped tube 14; the laser triangular displacement sensor 11 is installed above the outdoor liquid-taking test tube 12; the laser triangular displacement sensor 11 is connected by the signal line 16 is connected with the industrial control electromechanical; the light signal that the laser triangular displacement sensor 11 sends detects the liquid level of the outdoor liquid-taking test tube 12 fixed on the detection workbench.

[0046] The liquid level is imaged on the linear array CCD4 of the laser tria...

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Abstract

The invention discloses a high-precision real-time laser triangulation method and a high-precision real-time laser triangulation device for a liquid level. The triangulation device comprises a laser triangulation displacement sensor, wherein the laser triangulation displacement sensor comprises a laser, a converging lens, a receiving objective and a charge coupled device (CCD); a laser beam emitted from the laser passes through the converging lens; the laser beam is refracted by a liquid surface; the laser beam is imaged on the CCD after passing through the receiving objective; the triangulation device also comprises an indoor liquid taking hopper, an indoor liquid taking test tube, an outdoor liquid taking test tube, a U-shaped tube and a signal line, wherein the indoor liquid taking hopper and the outdoor liquid taking test tube are fixedly arranged on a test worktable; the indoor liquid taking test tube is connected with the outdoor liquid taking test tube through the U-shaped tube; the laser triangulation displacement sensor is arranged above the outdoor liquid taking test tube; and the laser triangulation displacement sensor is electrically connected with an industrial personal computer through the signal line. The triangulation device has the advantages that: non-contact real-time liquid level measurement can be realized; and the sensitivity is high, the spectral response is wide, the dynamic range is wide, the linearity is high, the precision is high and the measurement range is wide.

Description

Technical field [0001] The present invention belongs to the field of liquid measuring technology. It is further provided to provide a non -contact measurement method and measurement device for a high -precision real -time laser triangle measurement and measurement device for liquid levels. Background technique [0002] The measurement method of the original liquid material liquid surface adopts the volume method, the measurement accuracy is low, the online measurement cannot be achieved, and the measurement accuracy requirements of the user cannot meet.This method invented a multi -point, non -contact, online, and high -precision measurement device to solve the problem. Invention content [0003] The present invention discloses a solution level high -precision real -time laser triangle measurement method to solve problems such as low measurement accuracy in existing technology and unable to achieve real -time measurement. [0004] The present invention also provides measurement ...

Claims

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Application Information

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IPC IPC(8): G01F23/292
Inventor 刘薇娜张树仁杨立峰马俊英李俊烨吴海红许文博刘荣荣
Owner CHANGCHUN UNIV OF SCI & TECH
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