Micro-cantilever beam piezoresistive bridge type sensor detecting instrument

Abstract

The invention relates to the technical field of biochemical sensor detection, in particular to a micro-cantilever beam piezoresistive bridge type sensor detecting instrument, which solves the problems that the traditional micro-cantilever beam piezoresistive bridge type sensor detecting instrument cannot carry out automatically zero setting or has low zero setting accuracy due to poor contact or abrasion of a mechanical potentiometer, and gain values of two output ends of an inner electric bridge cannot be adjusted. The micro-cantilever beam piezoresistive bridge type sensor detecting instrument comprises a micro-cantilever beam piezoresistive bridge type sensor, a first differential amplifier, a filter, a voltage follower, a singlechip, a computer and an LCD (liquid crystal display); a high-speed synchronous serial port input end of a digital-to-analog converter is connected with a high-speed synchronous serial port output end of the singlechip; a voltage-dividing circuit which is formed by serially connecting a third resistor and a fourth resistor is connected between a fine-tuning signal output end of the digital-to-analog converter and the ground. The micro-cantilever beam piezoresistive bridge type sensor detecting instrument has the advantages of reasonable structure, ingenious design, small volume, low power consumption and strong universality, and can be widely suitable for biochemical detection, automobiles, meteorology and a plurality of industrial devices.

Description

technical field [0001] The invention relates to the technical field of biochemical sensor detection, in particular to a micro-cantilever piezoresistive bridge sensor detector. Background technique [0002] Micro-cantilever piezoresistive bridge sensors are mainly used in automobiles, meteorology and many industrial equipment. In the field of biochemistry, it can use self-assembly technology to modify different special components on the micro-cantilever for DNA, various antigens, viruses, and organic substances. and various biochemical substances for concentration detection. The working principle of the micro-cantilever piezoresistive bridge sensor is to use MEMS technology to obtain piezoresistors on the cantilever beam to form an internal bridge, and obtain the change of the cantilever beam by detecting the differential signal output by the internal bridge, and then pass a certain Calculation to obtain the concentration of the measured substance. Due to technical reasons,...

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Problems solved by technology

[0004] The invention solves the problem that the traditional micro-cantilever beam piezoresistive bridge sensor detector cannot be automatically zeroed or the zeroing precision is low due to poor contact or wear of the mechanical potentiometer and the gain values ​​of the two output ends of the internal bridge cannot be dynamically adjusted according to the measured object. To solve the problem, a micro-cantilever piezoresistive bridge sensor detector with closed-loop high-precision automatic zero adjustment and closed-loop automatic gain adjustment is provided, which is especially suitable for high-precision detection of weak signals of biochemical sensors, and can also be extended to micro Cantilever piezoresistive bridge sensor

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