Separately excited vibrating cylinder pressure sensor performance test method

Abstract

The present invention provides a separately excited vibrating cylinder pressure sensor performance test method, and the objective of the invention is to provide a test method with high test precision, reliable test data and high test efficiency. According to the technical scheme, the method comprises: in a separately excited vibrating cylinder pressure sensor performance test system, a vibrating cylinder pressure sensor is taken as a standard pressure sensor, a detected sensor taken as a detected piece is connected between the standard pressure sensor and a standard amplifier to form a test tool electrically connected with the detected sensor test circuit; a PXI data collection card is employed to collect the output frequencies of the standard pressure sensor and the detected sensor and the temperature voltage signals of the standard pressure sensor, the system test software is employed to calculate the actual error of each pressure point, and a comparison method is employed to determine whether the output precision with the maximum error difference being not larger than 1000ppm is taken as the approval standard of the detected sensor or not so as to test the room temperature output precision of the detected sensor.

Description

technical field [0001] The invention relates to a method for testing the sensor performance of an externally excited vibrating cylinder pressure sensor. Background technique [0002] With the continuous improvement of the quantity and accuracy of various information of air data in modern aircraft, air data computers have been widely used in modern aircraft to measure and process various air data information. The most basic information of the air data computer is the aircraft's flight altitude, true airspeed, indicated airspeed, Mach number, atmospheric temperature and atmospheric density, and the rest of the information can be calculated from these 6 information. And these six basic information are all obtained by solving the four original parameters of total pressure, static pressure, total temperature and angle of attack. Accurate and stable measurement of these four parameters is very important to ensure the accurate and stable work of the air data computer. Therefore, ...

AI Technical Summary

Problems solved by technology

The disadvantage of the existing technology is that the test results are relatively rough, which can only reflect whether there is a jump point in the working pressure range of the tested sensor, whether the output curve is a monotonic curve, and cannot directly judge whether the output accuracy of the tested sensor is Qualified, causing the tested sensor that passed the test to be out of tolerance in the subsequent calibration test

Secondly, the installation is troublesome. Each tested sensor must be tested by welding the test cable to the coil pin of the tested sensor, and only one tested sensor can be tested at a time.

When replacing components with different ranges and models for testing, it is also necessary to replace the test box, which is time-consuming and laborious

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