CN202229812U - Laser high precision liquid level real-time measuring instrument - Google Patents
Laser high precision liquid level real-time measuring instrument Download PDFInfo
- Publication number
- CN202229812U CN202229812U CN2011203284064U CN201120328406U CN202229812U CN 202229812 U CN202229812 U CN 202229812U CN 2011203284064 U CN2011203284064 U CN 2011203284064U CN 201120328406 U CN201120328406 U CN 201120328406U CN 202229812 U CN202229812 U CN 202229812U
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- laser
- test tube
- liquid level
- ccd
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Abstract
The utility model discloses a laser high precision liquid level real-time measuring instrument, which comprises a laser triangular displacement sensor. The laser triangular displacement sensor comprises a laser device, a convergent lens, a receiving objective lens and a charge coupled device (CCD). A laser beam sent by the laser device passes through the convergent lens, the laser beam is refracted through a liquid level, and the laser beam is imaged on the CCD after passing through the receiving objective lens. The laser high precision liquid level real-time measuring instrument is characterized by further comprising an indoor liquid taking funnel, an indoor liquid taking test tube, an outdoor liquid taking test tube, a U-shaped tube and a signal line. The indoor liquid taking test tube and the outdoor liquid taking test tube are fixedly installed on a detection workbench and connected through the U-shaped tube in communication mode, and the laser triangular displacement sensor is installed above the outdoor liquid taking test tube and electrically connected with an industrial personal computer through the signal line. The laser high precision liquid level real-time measuring instrument has the advantages of being capable of achieving non-contact real-time liquid level measurement, high in sensitivity, wide in spectral response, large in dynamic range, good in linearity, high in accuracy and large in measurement range.
Description
Technical field
The utility model discloses a kind of laser high-precision liquid level real-time measurement instrument device; Be applicable to the non-cpntact measurement that liquid level changes, belong to object physical quantity technical field.
Background technology
Original liquid levels measuring method generally 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 utility model provide a kind of to liquid level carry out multiple spot, noncontact, online, high precision measuring device addresses this problem.
Summary of the invention
The utility model discloses a kind of laser high-precision liquid level real-time measurement instrument device, with solve in the prior art measuring accuracy low, can not realize problem such as measurement in real time.
The laser high-precision liquid level real-time measurement instrument device that the utility model provides comprises the laser triangulation displacement transducer; 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; Comprise that also indoor and outdoor gets liquid test tube, UNICOM's U-shaped pipe, signal wire; 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).
Principle of work is following: 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.
The good effect of the utility model is: measured by contactless real-time level in the outdoor measuring chamber; 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 the utility model direct-injection type index path;
Fig. 2 is the utility model liquid level measurement system diagram;
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
An embodiment of accompanying drawings the utility model.Present embodiment is to be applied to the embodiment that liquid level is measured.
As shown in Figure 1: laser triangulation displacement transducer 11 comprises laser instrument 1, convergent lens 2, receiving objective 3, CCD 4; The laser beam that laser instrument 1 sends is passed convergent 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 utility model comprises laser triangulation displacement transducer 11, outdoor liquid test tube 12, indoor liquid test tube 13, U-shaped pipe 14, indoor liquid taking funnel 15, the signal wire 16 got got; 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 (1)
1. a laser high-precision liquid level real-time measurement instrument device comprises the laser triangulation displacement transducer; 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; It is characterized in that: 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203284064U CN202229812U (en) | 2011-09-04 | 2011-09-04 | Laser high precision liquid level real-time measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203284064U CN202229812U (en) | 2011-09-04 | 2011-09-04 | Laser high precision liquid level real-time measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202229812U true CN202229812U (en) | 2012-05-23 |
Family
ID=46080396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203284064U Expired - Fee Related CN202229812U (en) | 2011-09-04 | 2011-09-04 | Laser high precision liquid level real-time measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202229812U (en) |
-
2011
- 2011-09-04 CN CN2011203284064U patent/CN202229812U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20120904 |