Capacitance level sensor online measuring system and method thereof
A technology of liquid level sensor and measurement system, which is applied in the direction of liquid/fluid solid measurement, liquid level indicator and measuring device for physical variable measurement, which can solve the problems of weak anti-interference ability, poor precision, and large temperature influence, etc. Achieve the effect of good anti-stray capacitance performance, simple circuit and convenient calibration
Inactive Publication Date: 2018-06-29
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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[0004] The purpose of the present invention is to measure the capacitance of the liquid level sensor on-line, to overcome the shortcomings of poor precision in capacitance measurement, weak anti-interference ability, large influence by temperature, and need to switch circuits, so as to provide accurate basis for industrial monitoring and control
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[0033] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0034] Please also see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 ,in, figure 1 It is a functional principle block diagram of the present invention, figure 2 It is a schematic diagram of frequency conversion triangular wave oscillation unit, image 3 is the schematic diagram of the shaping and filtering unit, Figure 4 is a schematic diagram of the frequency capture principle, Figure 5 is the schematic diagram of the temperature compensation unit, Figure 6 is a schematic diagram of the analytical calibration unit.
[0035] From figure 1 It can be seen that the online measurement method and system of the capacitive liquid level sensor are composed of a frequency conversion triangular wave oscillation unit, a filtering and shaping unit, a frequency acquisition unit, a temperature compensation unit, and an analysis and cali...
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The invention discloses a capacitance level sensor online measuring system and method thereof. The capacitance level sensor online measuring system and method are used for liquid level monitoring, canmeasure the capacitance level sensor capacitance online, and mainly solve the problems that during sensor capacitance measuring, the anti-jamming capability, the anti-jamming precision, and the anti-jamming linearity are poor, the measuring range is greatly limited, the circuit is complicated and the reliability is low. By means of the capacitance level sensor online measuring system, a frequencyconversion triangular-wave oscillating unit conditions a capacitance level sensor signal into a triangular oscillating wave, then the signal is subjected to smoothing for noise jamming, and is shapedto be converted into a CMOS or TTL square wave signal; through a frequency capturing unit, a high-frequency impulse filling method is utilized to obtain the square wave signal frequency; then capacitance is analyzed out of the square wave frequency, and is subjected to temperature compensation and linear fitting to calculate the calibrated sensor capacitance. The capacitance level sensor online measuring system and method have the advantages that the measuring precision is high, the measuring range is wide and is configurable, the instantaneity is good, the anti-jamming capability is good, and the capacitance level sensor online measuring system and method are applicable to industrial embedded monitoring and control equipment.
Description
technical field [0001] The invention belongs to the technical field of monitoring and control, and is mainly used for liquid level monitoring of aviation fuel and the like. Specifically, it is a method and system for processing the signal of a capacitive liquid level sensor, which monitors the fuel level online in real time, and provides accurate fuel quantity information for the control and monitoring system. Background technique [0002] In the industry, there are a large number of requirements for liquid level measurement. Generally, capacitive sensors are used, which can easily convert the liquid level into capacitance, and realize the monitoring and control of the liquid level. For example, in the state monitoring and control of aeroengines, the fuel level is monitored to provide accurate fuel quantity information and overrun warning information for the engine control system and aircraft system, which is related to the correct control of the engine and flight safety. ...
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IPC IPC(8): G01F25/00G01F23/26
CPCG01F23/263G01F25/20
Inventor 喻鸣白洁程苏赵建平郝建
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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