High-precision performance detector of resonant mode water level sensor and test method thereof

Abstract

The invention relates to a high-precision performance detector of a resonant mode water level sensor and a test method thereof. In the high-precision performance detector, an air chamber pressure change is adopted to simulate an actual water level change; resonant mode water level sensor values in the air chamber are collected and then transmitted to a controller so as to be processed to obtain a sensor performance curve; and the change of air quantity in the air chamber is equal to that of a liquid level in a water tank. The high-precision performance detector can be used for completely eliminating the defects of low stability, low precision and high error of the traditional test system. In the invention, firstly, a novel high-precision frequency measuring method is utilized so that the frequency measuring error of the system is not more than +/-5 Hz and the system precision reaches a new level compared with the errors of dozens of hertz even hundreds of hertz in the traditional test system; secondly, the system is fitted by sampled data through using a least square method and the system output curve is extremely optimized, so that a performance test curve of the sensor is more approximate to a real curve; and finally, a processor chip with a high integration level is adopted so that the reliability of the system is also obviously improved.

Description

technical field [0001] The invention relates to a detection instrument, in particular to a high-precision resonant water level sensor performance detector and a test method. Background technique [0002] Resonant water level sensors have played an important role in the fields of industrial process control, automobile, environment and safety monitoring, and military affairs. In practical applications, the water level sensor is an important part of data collection, and its performance will directly determine the accuracy and precision of the collected data. [0003] At present, there are various automatic test systems for the performance of water level sensors in the market, mainly using PC or single-chip microcomputer as the controller. However, most of the traditional systems have a common disadvantage of low stability and measurement accuracy. Contents of the invention [0004] The present invention aims at the problem of low stability and measurement accuracy of the cu...

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Problems solved by technology

[0004] The present invention aims at the problem of low stability and measurement accuracy of the current automatic test system for the performance of water level sensors, and proposes a high-pr

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