Measure method applied to circuit of resistor-type moisture measure sensor

Abstract

The invention discloses a measure method applied to a circuit of a resistor-type moisture measure sensor, and relates to the field of measuring of grain moisture. The circuit comprises a power supply unit connected with a CPU acquisition processing unit and a voltage-raising voltage-stabilizing unit; the voltage-raising voltage-stabilizing unit is connected with an electron change-over switch respectively via a first standard resistor, a second standard resistor and a third current-limiting resistor; the electron change-over switch is connected with the CPU acquisition processing unit, an operational amplifier and a second triode; the operational amplifier is connected with a first triode and the second triode, and also the output terminal of the operational amplifier is connected with a reverse-direction input terminal via a capacitor; the voltage-raising voltage-stabilizing unit is connected with the second triode via the first triode; and the voltage-raising voltage-stabilizing unit is connected with an A/D acquisition module via a transition linearity correction amplification processing unit. When moisture in grains is measured, the measuring speed is fast, the measuring scope is relatively wide, and also the measuring stability is relatively high. The measure method is relatively wide in application scope.

Description

technical field [0001] The invention relates to the field of grain moisture measurement, in particular to a measurement method for a circuit of a resistive moisture measurement sensor. Background technique [0002] With the development of society, the measurement and analysis instruments used to measure the moisture of substances have been widely used in society. At present, the common measurement and analysis instruments are resistive moisture meter and capacitive moisture meter; the measurement of resistive moisture meter The stability is high, and the measurement range of the capacitive moisture meter is wide. [0003] However, the resistive moisture meter and the capacitive moisture meter have the following defects respectively: [0004] (1) Resistive moisture measurement method measures the moisture of the measured object according to the corresponding ratio between the resistance characteristic of the measured object and the contained moisture. Because the resistance...

AI Technical Summary

Problems solved by technology

Since the distributed capacitance will change with the change of temperature and time, the oscillation frequency of the oscillating circuit or the RC time signal will change with the change of temperature and time, which makes the moisture value measured by the capacitive moisture meter easy Drift, poor measurement stability

[0007] In addition, there are other moisture measuring instruments on the market, such as microwave, nuclear magnetic resonance, infrared and other measurement and analysis instruments. Frequent Calibration and Maintenance

The above-mentioned moisture measuring instruments are mainly used in places where resistive moisture measuring instruments and capacitive moisture measuring instruments cannot measure (such as tea, tobacco, objects with large individual differences, and laboratories), and their scope of application is relatively single

Images