Strain gauge sensor experimental device and control method

Abstract

The strain gauge sensor experimental device comprises a power supply unit (1), a strain signal processing unit (2), a key unit (3), a programming interface unit (4), a single chip microcomputer unit (5), a voltage output unit (6), a data display unit (7), a communication interface unit (8) and a communication module (9). The invention has the advantages that the single chip microcomputer is used for intelligent processing, the usability of experiment operation is improved, and students can concentrate on the characteristics of the sensor in limited practical training time instead of spending a lot of time on irrelevant complicated circuit debugging; single power supply operation is used, power supply complexity is reduced, a protection element for preventing reverse connection of the power supply is arranged, and the experiment device is prevented from being damaged due to wrong connection of a power line by students; the amplifier is a rail-rail amplifier with high input impedance, the number of needed amplifiers is reduced, the output dynamic range can be effectively enlarged, and the saturation phenomenon is not prone to occurring.

Description

technical field [0001] The invention relates to a signal processing technology of a sensor, in particular to an experimental device for a strain gauge sensor, and belongs to the technical field of sensor application. Background technique [0002] The resistance strain sensor is composed of pasting resistance strain gauges on the elastic element through a specific process, and uses the strain effect of the resistance material to convert the internal deformation of the engineering structure into a sensor of resistance change. This type of sensor is mainly through a certain mechanical device. The measurement is converted into the deformation of the elastic element, and then the deformation is converted into the change of resistance by the resistance strain gauge, and then the change of the resistance is converted into the voltage or current change signal output through the measuring circuit. It can be used to detect various non-electrical physical quantities that can be transfo...

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Problems solved by technology

[0009] It can be seen that multiple sets of positive and negative power supplies are required for the experiment, and there is no effective power protection on the circuit. Students often damage the experimental device due to wrong wiring, and the operation steps are more complicated. Combined operation of multiple potentiometers for zero adjustment and gain adjustment, such as differential amplifier zero adjustment, bridge balance adjustment, and post-stage op amp zero adjustment, and some potentiometers affect each other during adjustment operations, affecting to a greater extent The accuracy of the experimental data

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