CN102419198A - High-precision real-time laser triangulation method and triangulation device for liquid level - Google Patents
High-precision real-time laser triangulation method and triangulation device for liquid level Download PDFInfo
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- CN102419198A CN102419198A CN2011102586150A CN201110258615A CN102419198A CN 102419198 A CN102419198 A CN 102419198A CN 2011102586150 A CN2011102586150 A CN 2011102586150A CN 201110258615 A CN201110258615 A CN 201110258615A CN 102419198 A CN102419198 A CN 102419198A
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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
The invention belongs to the liquid level gauging technical field, further say laser triangulation method and measurement mechanism when having provided a kind of liquid level high-precision real, be specially adapted to the non-cpntact measurement that the liquid substance liquid level changes.
Background technology
The measuring method of original liquid substance liquid level adopts volumetric method, and measuring accuracy is low, can not realize on-line measurement, can't satisfy the measuring accuracy requirement that the user proposes.This method invention a kind of to liquid level carry out multiple spot, noncontact, online, high precision measuring device addresses this problem.
Summary of the invention
Laser triangulation method when the present invention discloses a kind of liquid level high-precision real, with solve in the prior art measuring accuracy low, can not realize problem such as measurement in real time.
The present invention also provides the measurement mechanism of realizing said method, detects when being used for the liquid level high-precision real.
Laser triangulation method during liquid level high-precision real disclosed by the invention, adopt following technical solution:
Form the laser triangulation displacement transducer by laser instrument, plus lens, receiving objective, CCD; The laser triangulation displacement transducer is installed in the outdoor liquid test tube top of getting; The indoor liquid test tube of getting is connected with the U-shaped pipe with the outdoor liquid test tube of getting; The laser triangulation displacement transducer is electrically connected with industrial computer by signal wire; The laser beam that laser instrument sends is passed plus lens, and laser beam is through the liquid level refraction, and laser beam forms images on CCD4 through behind the receiving objective; Liquid level is the second state liquid level by the first state level change; The light signal that the laser triangulation displacement transducer sends detects the outdoor liquid test tube liquid level of getting, and liquid level is imaged on the line array CCD, measures liquid level; Simultaneously, detect data, accomplish data acquisition and processing (DAP) through the industrial computer data acquisition system (DAS);
Utilize the proportionate relationship on each limit of triangle, it is following to calculate the derivation displacement formula:
In the following formula:
A is laser beam optical axis and the distance of the intersection point that receives optical axis to the receiver lens front principal plane;
B be behind the receiver lens interarea to the distance of imaging surface central point;
Convert time-domain signal into the spatial domain signal; Pixel value on the corresponding CCD can be calculated the distance
that laser facula moves accurately on CCD.
Wherein:
。
N
0The pixel value of inconocenter on CCD in the time of for calibration;
N is the pixel value after picture point moves;
The shift length of calculating on CCD promptly gets liquid level with the CCD displacement conversion simultaneously and changes.
Realize the real-time measurement apparatus of above-mentioned measuring method, it is characterized in that:
The laser triangulation displacement transducer comprises laser instrument, convergent lens, receiving objective, CCD; The laser beam that laser instrument sends is passed convergent lens, and laser beam is through the liquid level refraction, and laser beam forms images on CCD through behind the receiving objective; Also comprise indoor liquid taking funnel, indoor liquid test tube, outdoor liquid test tube, U-shaped pipe, the signal wire got got; Indoorly get the liquid test tube and the outdoor liquid test tube of getting is fixedly mounted on the testing platform; The indoor liquid test tube of getting is connected with the U-shaped pipe with the outdoor liquid test tube of getting; The laser triangulation displacement transducer is installed in the outdoor liquid test tube top of getting; The laser triangulation displacement transducer is electrically connected with industrial computer by signal wire.The light signal that the laser triangulation displacement transducer sends detects the outdoor liquid test tube liquid level of getting that is fixed on the testing platform table top, and liquid level is imaged on the line array CCD, measures liquid level; Simultaneously, detect data, accomplish data acquisition and processing (DAP) through the industrial computer data acquisition system (DAS).
Good effect of the present invention is:Can realize contactless real-time level measurement; Highly sensitive, spectral response is wide, dynamic range is big, good linearity; Especially precision is high, measurement range is big and the advantage of non-cpntact measurement, makes it demonstrate unique advantages in the level gauging field.
Description of drawings
Fig. 1 is a direct-injection type index path of the present invention;
Fig. 2 is liquid level test principle figure of the present invention;
Among the figure: 1, laser instrument; 2, plus lens; 3, receiving objective; 4, CCD; 11, the laser triangulation displacement passes
Sensor; 12, the outdoor liquid test tube of getting; 13, the indoor liquid test tube of getting; 14, U-shaped pipe; 15, indoor liquid taking funnel; 16, signal wire; F1, the first state liquid level; F2, the second state liquid level.
Embodiment
Through following examples the present invention is described for example further; And do not limit the present invention in any way; Under the prerequisite that does not deviate from technical solution of the present invention, any change or change that those of ordinary skills that the present invention did are realized easily all will fall within the claim scope of the present invention.
As shown in Figure 1: laser triangulation displacement transducer 11 of the present invention comprises laser instrument 1, plus lens 2, receiving objective 3, CCD 4; The laser beam that laser instrument 1 sends is passed plus lens 2, and laser beam is through the liquid level refraction, and laser beam forms images on CCD4 through receiving objective 3 backs; Liquid level is changed to the second state liquid level F2 by the first state liquid level F1; Utilize the proportionate relationship on each limit of triangle, it is following to calculate the derivation displacement formula:
In the following formula:
A is laser beam optical axis and the distance of the intersection point that receives optical axis to the receiver lens front principal plane;
B be behind the receiver lens interarea to the distance of imaging surface central point;
Convert time-domain signal into the spatial domain signal; Pixel value on the corresponding CCD can be calculated the distance
that laser facula moves accurately on CCD.
Wherein:
N
0The pixel value of inconocenter on CCD in the time of for calibration;
N is the pixel value after picture point moves;
The shift length of calculating on CCD is that liquid level changes with the CCD displacement conversion simultaneously.
Like Fig. 1, shown in Figure 2: the present invention by laser triangulation displacement transducer 11, outdoorly get liquid test tube 12, the indoor liquid test tube 13, U-shaped pipe 14, indoor liquid taking funnel 15, signal wire 16 got constitutes; The indoor liquid test tube 13 of getting is fixedly mounted on the testing platform with the outdoor liquid test tube 12 of getting; The indoor liquid test tube 13 of getting is connected with the outdoor liquid test tube 12 usefulness U-shaped pipes 14 of getting; Laser triangulation displacement transducer 11 is installed in outdoor liquid test tube 12 tops of getting; Laser triangulation displacement transducer 11 is electrically connected with industrial computer by signal wire 16; The light signal that laser triangulation displacement transducer 11 sends detects outdoor liquid test tube 12 liquid levels of getting that are fixed on the testing platform table top.
Liquid level is imaged on the line array CCD 4 of laser triangulation displacement transducer 11, measures liquid level; Simultaneously, detect data, accomplish data acquisition and processing (DAP) through the industrial computer data acquisition system (DAS).
Claims (2)
1. laser triangulation method during a liquid level high-precision real is characterized in that: form the laser triangulation displacement transducer by laser instrument, plus lens, receiving objective, CCD; The laser triangulation displacement transducer is installed in the outdoor liquid test tube top of getting; The indoor liquid test tube of getting is connected with the U-shaped pipe with the outdoor liquid test tube of getting; The laser triangulation displacement transducer is electrically connected with industrial computer by signal wire; The laser beam that laser instrument sends is passed plus lens, and laser beam is through the liquid level refraction, and laser beam forms images on CCD4 through behind the receiving objective; Liquid level is the second state liquid level by the first state level change; The light signal that the laser triangulation displacement transducer sends detects the outdoor liquid test tube liquid level of getting, and liquid level is imaged on the line array CCD, measures liquid level; Simultaneously, detect data, accomplish data acquisition and processing (DAP) through the industrial computer data acquisition system (DAS);
Utilize the proportionate relationship on each limit of triangle, it is following to calculate the derivation displacement formula:
In the following formula:
A is laser beam optical axis and the distance of the intersection point that receives optical axis to the receiver lens front principal plane;
B be behind the receiver lens interarea to the distance of imaging surface central point;
is the angle between detector and the receiver lens optical axis;
Convert time-domain signal into the spatial domain signal; Pixel value on the corresponding CCD is calculated the distance
that laser facula moves accurately on CCD; Wherein:
N
0The pixel value of inconocenter on CCD in the time of for calibration;
N is the pixel value after picture point moves;
is the pixel centre distance of line array CCD;
The shift length of calculating on CCD promptly gets liquid level with the CCD displacement conversion simultaneously and changes.
2. realize the real-time measurement apparatus of the said measuring method of claim 1, it is characterized in that: the laser triangulation displacement transducer comprises laser instrument, convergent lens, receiving objective, CCD; The laser beam that laser instrument sends is passed convergent lens, and laser beam is through the liquid level refraction, and laser beam forms images on CCD through behind the receiving objective; Also comprise indoor liquid taking funnel, indoor liquid test tube, outdoor liquid test tube, U-shaped pipe, the signal wire got got; Indoorly get the liquid test tube and the outdoor liquid test tube of getting is fixedly mounted on the testing platform; The indoor liquid test tube of getting is connected with the U-shaped pipe with the outdoor liquid test tube of getting; The laser triangulation displacement transducer is installed in the outdoor liquid test tube top of getting; The laser triangulation displacement transducer is electrically connected with industrial computer by signal wire.
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| CN2011102586150A CN102419198A (en) | 2011-09-04 | 2011-09-04 | High-precision real-time laser triangulation method and triangulation device for liquid level |
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| CN2011102586150A CN102419198A (en) | 2011-09-04 | 2011-09-04 | High-precision real-time laser triangulation method and triangulation device for liquid level |
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Cited By (9)
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| CN103424071A (en) * | 2012-05-23 | 2013-12-04 | 北京理工大学 | Inner bore measuring head inherent geometrical parameter calibration method based on laser triangulation |
| CN103542912A (en) * | 2013-11-14 | 2014-01-29 | 中华人民共和国太仓出入境检验检疫局综合技术服务中心 | Laser water level gauge based on laser distance measurement |
| GB2509716A (en) * | 2013-01-09 | 2014-07-16 | Internat Moisture Analysers Ltd | Optical chemical analyser and liquid depth sensor |
| CN104897243A (en) * | 2015-06-17 | 2015-09-09 | 电子科技大学 | Optical ranging based transparent liquid level measuring device and method |
| CN105526992A (en) * | 2016-01-22 | 2016-04-27 | 北京小米移动软件有限公司 | Water level measuring method as well as device and container |
| CN107356263A (en) * | 2017-06-01 | 2017-11-17 | 中国计量科学研究院 | A kind of hydrostatic level calibrating installation based on laser displacement measurement method |
| CN107462302A (en) * | 2017-08-02 | 2017-12-12 | 浙江中产科技有限公司 | A kind of method of laser material position data processing |
| US10401209B2 (en) | 2016-06-22 | 2019-09-03 | Abbott Laboratories | Liquid level sensing apparatus and related methods |
| CN111189512A (en) * | 2020-02-25 | 2020-05-22 | 广州奥格智能科技有限公司 | Device and method for measuring liquid level and refractive index of transparent liquid based on laser ranging |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424071B (en) * | 2012-05-23 | 2016-02-10 | 北京理工大学 | The intrinsic geometrical parameter calibration method of endoporus gauge head based on laser triangulation |
| CN103424071A (en) * | 2012-05-23 | 2013-12-04 | 北京理工大学 | Inner bore measuring head inherent geometrical parameter calibration method based on laser triangulation |
| US10041880B2 (en) | 2013-01-09 | 2018-08-07 | International Moisture Analysers Limited | Optical chemical analyser and liquid depth sensor |
| GB2509716A (en) * | 2013-01-09 | 2014-07-16 | Internat Moisture Analysers Ltd | Optical chemical analyser and liquid depth sensor |
| US10508989B2 (en) | 2013-01-09 | 2019-12-17 | International Moisture Analysers Limited | Optical chemical analyser and liquid depth sensor |
| GB2509716B (en) * | 2013-01-09 | 2018-07-04 | International Moisture Analysers Ltd | Spatial Interference Fourier Transform Raman chemical analyser |
| CN103542912A (en) * | 2013-11-14 | 2014-01-29 | 中华人民共和国太仓出入境检验检疫局综合技术服务中心 | Laser water level gauge based on laser distance measurement |
| CN104897243A (en) * | 2015-06-17 | 2015-09-09 | 电子科技大学 | Optical ranging based transparent liquid level measuring device and method |
| CN104897243B (en) * | 2015-06-17 | 2017-11-10 | 电子科技大学 | Liquid level emasuring device and level measuring method based on anallatic transparency liquid |
| CN105526992A (en) * | 2016-01-22 | 2016-04-27 | 北京小米移动软件有限公司 | Water level measuring method as well as device and container |
| US10401209B2 (en) | 2016-06-22 | 2019-09-03 | Abbott Laboratories | Liquid level sensing apparatus and related methods |
| US10760939B2 (en) | 2016-06-22 | 2020-09-01 | Abbott Laboratories | Liquid level sensing apparatus and related methods |
| CN107356263A (en) * | 2017-06-01 | 2017-11-17 | 中国计量科学研究院 | A kind of hydrostatic level calibrating installation based on laser displacement measurement method |
| CN107462302B (en) * | 2017-08-02 | 2019-06-21 | 浙江中产科技有限公司 | A kind of method of laser material position data processing |
| CN107462302A (en) * | 2017-08-02 | 2017-12-12 | 浙江中产科技有限公司 | A kind of method of laser material position data processing |
| CN111189512A (en) * | 2020-02-25 | 2020-05-22 | 广州奥格智能科技有限公司 | Device and method for measuring liquid level and refractive index of transparent liquid based on laser ranging |
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Application publication date: 20120418 |