Bridge type resistor strain sensor multi-mode fault detection device

Abstract

The invention provides a bridge type resistor strain sensor multi-mode fault detection device; under a broken line open circuit fault or a lead wire short circuit fault or a combined fault mode, a bridge type resistor strain sensor output line is pre-biased through a bias circuit; a high frequency signal is filtered by a radio frequency noise suicide circuit; the bridge type resistor strain sensor output line enters an instrument amplification circuit; the instrument amplification circuit amplifies a difference signal outputted by the bridge type resistor strain sensor; the amplified difference signal is compared with a reference voltage, set by a fault discrimination reference voltage set circuit, in a level comparison circuit, thus determining various fault modes of the bridge type resistor strain sensor; logic integration is finally realized by the line and circuit so as to output a logic signal, thus determining whether the bridge type resistor strain sensor has fault or not. The bridge type resistor strain sensor multi-mode fault detection device needs less parts, is easy to buy, low in cost, thus realizing various functions of the instrument amplifier, and effectively reducing PCB area and cost.

Description

technical field [0001] The invention relates to a bridge type resistance strain sensor fault detection device. Background technique [0002] The bridge-type resistance strain sensor is a measuring device that uses a metal elastic body as an elastic element, forms a Wheatstone bridge by pasting it on the sensitive part of the elastic body, and converts the deformation into an electrical signal under the excitation of an external power supply. The bridge type resistance strain sensor has the advantages of excellent dynamic and static characteristics, high resolution, small error, large measurement range, can work in various harsh environments, small size, light weight, low price, and various varieties, etc. It is easy to choose and use in large quantities , It is widely used in many test and measurement fields such as force, pressure, weighing, displacement, acceleration and torque. [0003] The Wheatstone bridge composed of bridge resistance strain sensors generally has four...

AI Technical Summary

Problems solved by technology

Therefore, there is an urgent technical demand for simultaneous detection of multiple fault modes in industrial and agricultural production, especially in aerospace and other application fields that require high reliability. However, the current known technologies cannot simultaneously detect multiple fault modes of such sensors effective detection

Patent CN201210176421 "A Redundant Device and Control Method for Aircraft Electric Brake Pressure Sensor" proposes a method of judging whether the output value of the sensor exceeds the fault threshold, but it can only detect the disconnection and open circuit faults of some sensors, and it can detect multiple complex combination modes Open-circuit faults and short-circuit faults cannot be effectively discriminated

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