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

A technology for measuring sensors and measuring methods, applied in the direction of material resistance, etc., can solve the problems of low measurement stability, single application range, poor measurement stability, etc., and achieve fast sampling speed and measurement speed, high resolution and measurement accuracy , the effect of wide measurement range

Active Publication Date: 2014-08-20
武汉凯特复兴科技有限责任公司
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  • Claims
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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

Method used

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

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0037] see figure 1 As shown, the circuit for the resistive moisture measurement sensor in the embodiment of the present invention includes a power supply unit, a communication interface unit, a voltage boosting and stabilizing unit, a CPU acquisition processing unit, a sensor, a first standard resistor RB1, a second standard resistor RB2, first current limiting resistor RA1, second current limiting resistor RA2, third current limiting resistor RA3, electronic switch K1, operational amplifier IC1, capacitor C1, first triode Q1, second triode Q2 and signal Conversion linear correction amplification processing unit.

[0038] The resistance value of the first standard resistor RB1 may be 1000˜10000 kΩ, and the resistance value of the second standard resistor RB2 may be 10˜100 kΩ. The resistance value of the first current limiting resistor RA1 m...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 万志雄李巍
Owner 武汉凯特复兴科技有限责任公司
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