CN102435391A - Device for real-time detecting precision of pressure scanning system sensor - Google Patents

Abstract

The present invention discloses a device for real-time verification of the accuracy of a pressure scanning system sensor. The pressure sensor collects the pressure output by the sensor calibration system to a multiplexer to obtain analog pressure data, and obtains digital signal pressure data through an AD converter. The pressure scanning acquisition system serially scans to obtain real-time pressure data, and a high-speed parallel acquisition card collects parallel data in parallel and transmits it to an industrial control machine. The industrial control machine transmits the parallel data to a pressure calibration source, performs pressure calibration on the pressure sensor respectively, obtains calibration data, and the industrial control machine uses the calibration data as a pressure standard to perform accuracy level verification on the corresponding real-time pressure data, and verifies the accuracy level of the pressure sensor respectively. The present invention can verify the accuracy of the pressure scanning system sensor in real time, and the method is simple, reliable, and highly practical.

Description

A device for real-time verification of the sensor accuracy of a pressure scanning system

technical field

The invention relates to the technical field of testing pressure scanning system sensors, in particular to a device for real-time testing of the precision of pressure scanning system sensors.

Background technique

The pressure scanning system is a pressure scanning pressure acquisition instrument, which is mainly used in the wind tunnel experiment to collect the pressure distribution on the surface of the airfoil and the pressure on the wall of the tunnel. The pressure scanning system is composed of multiple pressure data channels. For example, the currently common 9816 Ethernet intelligent pressure scanning system can simultaneously scan and collect thousands of pressure data channels at most. The core of the pressure data channel is the pressure sensor. During the process of scanning and collecting data from the pressure sensor, there will be sensor acquisition errors due to various reasons. This problem is not easy to be found in real-time collection, which often reduces the collection accuracy and causes data errors. In some very important occasions, it is absolutely necessary to ensure that the collected data is within the error range, so it is very important to calibrate the sensors of the pressure scanning system in real time to find out that the collection accuracy is reduced and the quality is deteriorated. At present, many researches have been done on real-time verification or calibration of pressure sensors at home and abroad. Such as: 1. The Chinese patent "Pressure Sensor with Electronic Data Sheet" with the application number CN200680052964.4 is mainly used to improve the accuracy of the pressure sensor. The correction coefficient group is suitable for improving the acquisition accuracy of a single pressure sensor, but Acquisition accuracy and quality of pressure scanning system sensors cannot be verified. 2. The Chinese patent "Automatic Error Warning Method for Measuring Equipment Custom Error Range System" with application number CN200810203406.4 can use the automatic early warning method to warn the measurement results of the pressure sensor beyond the error range in real time, and realize the measurement results of the measurement equipment Strict control, this method is only suitable for a single pressure sensor early warning can not be real-time monitoring and verification of the pressure scanning system. 3. The Chinese patent "Signal Compensation Method for High Precision Pressure Sensor" with the application number CN201010202078.3 can compensate the hysteresis error, nonlinear error and the error caused by the change of ambient temperature of the pressure sensor. This method is only suitable for compensating the error of a single pressure sensor . 4. The Chinese patent "sensor device" with the application number CN201010105690.9 is suitable for diagnosing faults or hidden faults from angles, and its basic principle does not meet the requirements for real-time verification of the sensor accuracy of the pressure scanning system. It can be seen from the above data that the current existing technology is unable to verify the decrease in acquisition accuracy and quality of sensors in the pressure scanning system in real time.

Contents of the invention

In order to overcome the shortcomings of the prior art that the accuracy of pressure scanning system sensor cannot be verified in real time and the quality becomes worse, the present invention provides a device for real-time verification of the sensor accuracy of the pressure scanning system, which overcomes the problem that the traditional technology can only verify the accuracy of a single pressure sensor The problem is that the accuracy of the sensor of the pressure scanning system can be verified in real time to find out that the pressure sensor’s collection accuracy is reduced and the data collection quality is deteriorating, so as to ensure the accuracy of the data collected by the pressure scanning system sensor.

The technical solution adopted by the present invention to solve the technical problems is: comprising a sensor calibration system, N pressure sensors, M multiplexers, 16-bit high-speed AD converter, pressure scanning acquisition system, real-time pressure memory, industrial control machine, High-speed parallel acquisition card, pressure calibration source, calibration data memory. N is any natural number greater than or equal to 16, N=16×M, 1<=M<=256.

Choose G points arbitrarily from low to high within the range of each pressure sensor, 5<=G<=10, use 5-10 sets of data to test the accuracy error according to the pressure sensor test method stipulated by the state, generally choose 10 sets , N pressure sensors collect G groups of pressure output from the sensor calibration system to M multiplexers to obtain G groups of analog pressure data, which are converted by 16-bit high-speed AD converters to obtain G groups of digital signal pressure data P _{digital signal N} , by The pressure scanning acquisition system serially scans in chronological order to obtain G groups of real-time pressure data P _{real-time N} and store them in the real _{-time pressure memory. At the same time, the high-speed parallel acquisition card collects G groups of digital signal pressure data P} in parallel to obtain parallel data P _{Parallel N} , transmitted to the industrial control machine, the industrial control machine transmits the parallel data P _{parallel N} to the pressure calibration source, performs pressure calibration on the N pressure sensors respectively, and stores the calibration data P _{calibration N} into the calibration data memory, the industrial control The machine transfers the P _{calibration N} data of the G group from the calibration data memory, and transfers the P real- _{time N} data of the G group from the real-time pressure memory, and uses the G group calibration data P _{calibration N} as the pressure standard. The verification method is to verify the accuracy level of the P _{real-time N} data of the corresponding G group, and respectively verify the accuracy levels of the pressure data P _{real-time N} of the N pressure sensors. When the accuracy error of a certain pressure sensor is greater than the error specified in the manual, it means that the acquisition accuracy and quality of a certain sensor in the pressure scanning system are reduced.

The pressure calibration source includes a compressor pump controller, an air compressor pump and a pressure measuring and controlling instrument. Use the industrial controller to output DC voltage to the compressor pump controller to drive the air compressor pump to work, and start the pressure measuring and controlling instrument through the air circuit. After starting, the industrial controlling computer controls the pressure measuring and controlling instrument in group G From low to high, P _{parallel N} is the range in sequence, and the corresponding N pressure sensors are respectively pressure calibrated through the sensor calibration system. After calibration, the G group of calibration data P _{calibration N} is obtained, and stored in sequence through the industrial control machine. into the calibration data memory.

The beneficial effects of the present invention are: the present invention overcomes the problem that the traditional technology can only verify the accuracy of a single pressure sensor, and can verify the accuracy of the pressure scanning system sensor in real time. To achieve real-time verification of the sensor accuracy of the pressure scanning system, it is found that the pressure sensor has a decrease in acquisition accuracy and a poor quality. In order to improve the accuracy of real-time acquisition of the pressure sensor. The method is simple, reliable and practical, and can be widely used in scientific research, industrial production and related fields.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Accompanying drawing 1 is a schematic diagram of the device of the present invention;

Accompanying drawing 2 is a schematic diagram of a pressure calibration source (wherein the dotted line is a gas path).

Detailed ways

Fig. 1 is a schematic diagram of the device of the present invention, where N=608, M=38, and G=10 are selected. Using 608 pressure sensors of the model PSI9816 to collect the output of the sensor calibration system of JCX-1 from 10 sets of pressure to 38 multiplexers of the model ADG731 to obtain 10 sets of analog pressure data, through the 16-bit model of AD9238 The high-speed AD converter converts 10 sets of digital signal pressure data P _{digital signal 608} , and the pressure scanning acquisition system of model PSI9816-98RK serially scans 10 sets of real-time pressure data P _{real-time N} , and stores them in the model. K9WBG08U1M's real-time pressure memory, and the high-speed parallel acquisition card model EM-9135 collects 10 groups of digital signal pressure data P _{digital signal 608} in parallel, and obtains parallel data P _{parallel 608} , which is transmitted to the industrial control machine model IPC610, industrial control machine Transmit the parallel data P _{parallel 608} to the pressure calibration source, perform pressure calibration on 608 pressure sensors respectively, and store the calibration data P _{calibration 608} in the calibration data storage, and the industrial control machine transfers 10 groups of calibration data from the calibration data storage. P _{calibration 608} data, transfer 10 groups of P _{real-time 608} data from the real-time pressure memory, take 10 groups of calibration data P _{calibration 608} as the pressure standard, and perform the corresponding 10 groups of P _{real-time 608} according to the pressure sensor verification method stipulated by the state. The data is verified by the accuracy level, and the accuracy level of the pressure value P _{and real-time N} of the 608 pressure sensors are respectively verified. It is found that the accuracy error of the N=27 pressure sensor is 0.17% and the accuracy error of the N=118 pressure sensor is 0.18% through the verification of the accuracy level. The accuracy errors of N=27 pressure sensor and N=118 pressure sensor are both greater than the 0.15% error stipulated in the specification, indicating that the collection accuracy and quality of pressure sensor 27 and 118 have deteriorated.

Fig. 2 is a schematic diagram of a pressure calibration source, which includes a compressor pump controller, an air compressor pump, and a pressure measuring and controlling instrument. Use the industrial control machine to output DC voltage to the compressor pump controller whose model is GDB-1, drive the air compressor pump whose model is VBH-JC to work, start the pressure measuring and controlling instrument whose model is CPC-6000 through the air circuit, and control it by the industry after starting The machine is controlled by the compressor pump controller and the air compressor pump. The pressure measurement and control instrument uses 10 sets of P _{parallel N} data from low to high 1...10 in sequence as the range, and the corresponding 608 pressure sensors are respectively adjusted by the sensor calibration system. Carry out pressure calibration, and get G group of calibration data P _{calibration N} after calibration, and store them in the calibration data memory in sequence through the industrial control machine.

Compared with the prior art, the present invention has the following significant advantages:

1) To overcome the problem that the traditional technology can only verify the accuracy of a single pressure sensor, the accuracy of the pressure scanning system sensor can be verified in real time.

2) Real-time verification of the sensor accuracy of the pressure scanning system can detect the decrease in acquisition accuracy and quality deterioration of the pressure sensor in time.

3) It can improve the accuracy of real-time data collection by the sensor of the pressure scanning system, and the method is simple, reliable and practical.

Working process: N pressure sensors collect the output G group pressure of the sensor calibration system to M multiplexers to obtain G group analog pressure data, and convert G group digital signal pressure data P _{digital signal N} through 16-bit high-speed AD converter , the pressure scanning acquisition system serially scans in chronological order to obtain G groups of real-time pressure data P _{real-time N} , and store them in the real-time pressure memory. At the same time, the high-speed parallel acquisition card collects G groups of digital signal pressure data _P The data P _{parallel N} is transmitted to the industrial control machine, and the industrial control machine transmits the parallel data P _{parallel N} to the pressure calibration source. Use the industrial controller to output DC voltage to the compressor pump controller to drive the air compressor pump to work, and start the pressure measuring and controlling instrument through the air circuit. After starting, the industrial controlling computer controls the pressure measuring and controlling instrument in group G From low to high, the data P _{parallel N} is the range in sequence, and the corresponding N pressure sensors are respectively pressure calibrated through the sensor calibration system. After calibration, G group calibration data P _{calibration N} is obtained, and the industrial control machine is used in sequence Stored in the calibration data memory. The industrial control machine transfers the P _{calibration N} data of the G group from the calibration data memory, and the P _{real-time N} data of the G group from the real-time pressure memory, and uses the G group calibration data P _{calibration N} as the pressure standard. In the pressure sensor verification method, the accuracy level verification is performed on the P _{real-time N} data of the corresponding G group, and the accuracy levels of the pressure values P _{real-time N} of the N pressure sensors are respectively verified. When the accuracy error of a certain pressure sensor is greater than the error specified in the manual, it means that the acquisition accuracy and quality of a certain sensor in the pressure scanning system are reduced.

Claims (2)

1. A device for real-time verification of the sensor accuracy of a pressure scanning system, including a sensor calibration system, N pressure sensors, M multiplexers, 16-bit high-speed AD converters, pressure scanning acquisition system, real-time pressure memory, and industrial control machine , high-speed parallel acquisition card, pressure calibration source, calibration data memory, characterized in that: N is any natural number greater than or equal to 16, N=16×M, 1<=M<=256; within the range of each pressure sensor by Arbitrarily select G points from low to high, 5<=G<=10, N pressure sensors collect G groups of pressure output from the sensor calibration system to M multiplexers, and obtain G groups of analog pressure data, through 16-bit high-speed AD The converter converts the G group of digital signal pressure data P _{digital signal N} , and the pressure scanning acquisition system serially scans in chronological order to obtain the G group of real-time pressure data P _{real-time N} , and stores it in the real-time pressure memory. At the same time, the high-speed parallel acquisition card runs parallel Collect G groups of digital signal pressure data P _{digital signal N} , obtain parallel data P _{parallel N} , and transmit it to the industrial control machine. The industrial control machine transmits the parallel data P _{parallel N} to the pressure calibration source, and performs pressure calibration on N pressure sensors respectively. And the calibration data P _{calibration N} is stored in the calibration data memory, and the industrial control machine transfers the P _{calibration N} data of the G group from the calibration data memory, and the P _{real-time N} data of the G group from the real-time pressure memory. Group calibration data P _{calibration N} is the pressure standard, and the accuracy level verification is performed on the P _{real-time N} data of the corresponding G group, respectively verifying the accuracy level of the pressure data P _{real-time N} of the N pressure sensors. 2. The device for verifying the accuracy of the pressure scanning system sensor in real time according to claim 1, characterized in that: the pressure calibration source includes a compressor pump controller, an air compressor pump and a pressure measuring and controlling instrument, and an industrial controller outputs a DC voltage To the compressor pump controller, drive the air compressor pump to work, and start the pressure measuring and controlling instrument through the air circuit. After starting, the industrial control machine controls the pressure measuring and controlling instrument through the compressor pump controller and the air compressor pump, respectively, in _parallel with G group from low to high P _N is the range in sequence, and the corresponding N pressure sensors are respectively pressure calibrated through the sensor calibration system. After calibration, G group calibration data P _{calibration N} is obtained, and stored in the calibration data memory in sequence through the industrial control machine.

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