CN203857977U - Automatic calibration system of pointer type instrument - Google Patents

Abstract

The utility model relates to an automatic calibration system of a pointer instrument, the system includes a camera, an electric pan/tilt, a bus, a memory, a test power supply, a standard meter and a host computer; the test power supply, the standard meter, a bus, a host computer and The memory is connected sequentially; the electric pan/tilt, camera, bus, host computer and memory are connected sequentially; the electric pan/tilt, camera, calibrated pointer instrument, bus, upper computer and memory are connected sequentially; the electric pan/tilt moves The camera is positioned above the pointer gauge being calibrated. The utility model uses the electric pan-tilt to transport the camera to the position above the dial and is perpendicular to the pointer, sends the collected images back to the upper computer through the bus, and uses the image processing technology to identify the measured value to realize calibration. The utility model can provide means for automatic calibration of various pointer instruments.

Description

An Automatic Calibration System of Pointer Meter

technical field

The utility model belongs to the pointer meter calibration technology, in particular to an automatic calibration system of the pointer meter.

Background technique

A pointer meter is a device that uses the position of the pointer to indicate the measurement result. Although digital instruments are widely used at present, pointer instruments have the advantages of simple structure, convenient maintenance, no electromagnetic field interference, high reliability, and low price. They are used in industrial, civil and military fields such as power systems, pneumatic systems, and hydraulic systems still has wide application.

There are many disadvantages in adopting the traditional manual calibration method for pointer instruments. The uncertainty of human factors, such as visual error and visual fatigue, will cause problems such as low degree accuracy and poor repeatability; irregular operations during the calibration process, such as adjusting the readings without permission, will cause artificial damage to the calibration meter; Enterprises, institutions and scientific research institutes that use pointer instruments need to set up calibration personnel, which increases management costs. Therefore, it is necessary to discuss the calibration method of the pointer meter, study a series of related issues such as automatic calibration, and ensure the accuracy of the pointer meter calibration.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides an automatic calibration system for pointer instruments, which can be applied to various pointer instruments. It is composed of host computer and background software. The electric pan/tilt is used to install and fix the camera, and can transport the camera to a position perpendicular to the pointer above the observed dial to achieve vertical observation and ensure the accuracy of video data reading. The camera is responsible for collecting image information, preliminarily processing and compressing the image, and then uploading it to the host computer through data line or wireless communication. The test power supply provides a unified reference for the standard meter and the tested pointer meter, and the reading of the standard meter is used as the agreed true value. The background software of the upper computer can register and fuse the uploaded images, identify the scale, scale and pointer position of the pointer meter, determine the degree of the measured pointer meter, and obtain the degree and agreed true value of the pointer meter The error, the standard table and display the actual value, calibration value and the collected image in the man-machine interface, store the results, and realize the automatic calibration of the pointer instrument.

The purpose of this utility model is to adopt following technical scheme to realize:

An automatic calibration system of a pointer instrument, the improvement of which is that the system includes a camera, an electric pan/tilt, a bus, a memory, a test power supply, a standard meter and an upper computer;

The test power supply, standard table, bus, upper computer and memory are connected in sequence; the electric pan/tilt, camera, bus, upper computer and memory are connected in sequence;

The electric pan/tilt, camera, calibrated pointer instrument, bus, upper computer and memory are connected in sequence;

The electric pan-tilt moves the camera to the top of the calibrated pointer instrument.

Preferably, a camera is installed and fixed on the electric pan/tilt.

Preferably, the camera is perpendicular to the pointer position above the pointer instrument to be calibrated.

Preferably, the test power supply is connected to the pointer instrument to be calibrated.

Preferably, the host computer includes an image registration and fusion module, an image recognition module, a human-computer interaction interface, and an electric pan-tilt control module.

Compared with the prior art, the beneficial effects of the utility model are:

The utility model uses the electric pan-tilt to transport the camera to the position above the dial and is perpendicular to the pointer, sends the collected images back to the upper computer through the bus, and uses the image processing technology to identify the measured value to realize calibration.

The utility model utilizes the electric platform to transport the camera to the position above the dial which is perpendicular to the pointer, and avoids the error caused by the observation angle.

The utility model saves the calibration result and the original image in the memory at the same time, which can facilitate query and solve doubts.

The utility model obtains the reading of the calibrated pointer instrument through the image processing technology, and avoids the influence of human factors on the calibration result.

The utility model can simultaneously calibrate a plurality of calibrated pointer instruments through bus control.

The utility model can provide means for automatic calibration of various pointer instruments.

Description of drawings

Fig. 1 is a schematic diagram of an automatic calibration system for a pointer instrument provided by the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

The utility model provides an automatic calibration system for a pointer instrument, which includes a test power supply 1, a standard meter 2, a bus 3, a host computer 4, an electric pan-tilt 5, a camera 6 and a memory 7.

The test power supply, standard meter, bus, upper computer and memory are connected in sequence; the electric pan/tilt, camera, bus, upper computer and memory are connected in sequence.

A video camera is installed and fixed on the electric pan-tilt.

The camera is perpendicular to the pointer position above the pointer gauge being calibrated.

The test power supply is connected with the pointer instrument to be calibrated.

The host computer includes an image registration and fusion module, an image recognition module, a human-computer interaction interface, and an electric pan-tilt control module.

The implementation of the automatic calibration system of a pointer instrument provided by the utility model is as follows:

1. The test power supply 1 outputs the reference value of the calibrated quantity to the standard meter 2 and the meter under test, and the reading of the standard test meter 2 is transmitted to the host computer 4 through the bus 3 as the actual value.

2. The electric pan/tilt 5 moves the camera 6 to a designated position, and the camera 6 collects images in the observation area.

3. Upload the collected data to the host computer 4 through the bus 3 .

4. After the host computer receives the uploaded images of each collection area, it stitches and fuses each image, and uses the image recognition module to identify the scale, scale and pointer position in the overall image formed.

5. By comparing the identified data with the reading (actual value) of the standard test instrument 2, the error and uncertainty of the tested instrument can be obtained to achieve calibration.

6. Simultaneously display the identified data, actual values, errors and uncertainties of the measured meter and the collected images on the human-computer interaction interface, and store them in the memory 7 .

Wherein, the upper computer 4 also controls the position of the camera 6 through the electric pan-tilt control module, so that the camera 2 can scan the entire instrument panel or observe a certain fixed point.

Among them, the camera can be transported to a position perpendicular to the pointer above the observed dial through the electric pan/tilt to realize vertical observation and reduce calibration errors.

Among them, the collected images can be uploaded to the host computer, and the readings of the pointer instruments can be automatically obtained through image fusion, splicing and recognition technologies.

Among them, the calibration value of the measured meter can be automatically obtained through the program in the host computer, according to the degree of the standard meter and the reading of the recognized measured meter.

Among them, the camera can scan the entire instrument panel for automatic calibration through the control of the electric pan/tilt, or realize manual verification for the observation of a fixed point.

Among them, the calibration results and the collected images can be saved through the memory, and recalled during review.

Example

1. The program-controlled DC power source CL6019 in the three-phase AC-DC instrument verification device CL3601B outputs the current reference value to the standard meter CL311V2 and the tested meter AC-DC ammeter T30, and the reading of the standard meter CL311V2 is transmitted to the host computer through the RS485 bus as the actual value .

2. The electric pan/tilt moves the integrated camera SCZ-2250PD to the designated position, and the SCZ-2250PD collects images in the observation area.

3. Upload the collected data to the host computer through the RS485 bus.

4. After the host computer receives the uploaded images of each collection area, it performs preprocessing such as image change, enhancement, filtering, threshold segmentation, binarization, expansion and thinning on each image, and then performs image registration, positioning and Stitching algorithms and fusion algorithms such as transition zone fusion, and identify the scale, scale and pointer position in the formed total image through template matching and pointer recognition algorithms.

5. Compare the identified data with the readings of the standard meter CL311V2, and use the comparison method to obtain the error and uncertainty of the AC/DC ammeter T30 to achieve calibration.

6. Simultaneously display the identified data, actual value, error and uncertainty of the measured meter and the collected image on the human-computer interaction interface, and save it in the memory.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible Any modification or equivalent replacement made to the specific implementation of the present utility model without departing from the spirit and scope of the present utility model shall be covered by the claims of the present utility model.

Claims (4)

1. An automatic calibration system of a pointer instrument, characterized in that the system includes a video camera, an electric pan-tilt, a bus, a memory, a test power supply, a standard table and an upper computer; The test power supply, standard table, bus, upper computer and memory are connected in sequence; the electric pan/tilt, camera, bus, upper computer and memory are connected in sequence; The electric pan/tilt, camera, calibrated pointer instrument, bus, upper computer and memory are connected in sequence; The electric pan-tilt moves the camera to the top of the calibrated pointer instrument. the 2. The automatic calibration system of a pointer instrument as claimed in claim 1, wherein a video camera is installed and fixed on the electric platform. the 3. The automatic calibration system of a pointer meter as claimed in claim 1, wherein the camera is perpendicular to the position of the pointer above the pointer meter to be calibrated. the 4. The automatic calibration system of a pointer meter as claimed in claim 1, wherein the test power supply is connected to the pointer meter to be calibrated. the