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Self-rating and temperature-drift-removable magnetostriction level sensor

A magnetostrictive liquid level and sensor technology, which is applied in the direction of buoy liquid level indicators, etc., can solve the problems of magnetostrictive liquid level sensor measurement accuracy discount, inability to completely eliminate measurement errors, large volume of temperature-compensated crystal oscillator, etc., and achieve structural Simple, eliminate measurement errors, and reduce system reliability

Inactive Publication Date: 2004-01-28
TIANJIN UNIV
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Problems solved by technology

[0004] For the measurement error caused by crystal oscillator temperature drift, although it can be reduced by using temperature-compensated crystal oscillator method, this passive compensation method only minimizes the negative impact of temperature drift, and cannot completely eliminate the measurement error caused by it
At the same time, due to the large volume and high price of the temperature-compensated crystal oscillator, it is rarely used in equipment with small volume and strict cost control such as liquid level sensors.
As for the error caused by the fluctuation of the liquid level-time proportional coefficient, there has not been a good method to eliminate it before.
[0005] Due to the existence of the above two factors, the measurement accuracy of the magnetostrictive liquid level sensor, which can originally achieve ultra-high precision measurement, is greatly reduced in practical applications.

Method used

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  • Self-rating and temperature-drift-removable magnetostriction level sensor

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specific Embodiment approach pic and specific Embodiment approach 1 ： Embodiment 1

[0013] Such as figure 1 , figure 2 As shown: the magnetostrictive liquid level sensor is composed of a sensor head 1, a waveguide 4, a waveguide wire 7, a liquid level float 5, and a magnet 6 inside the liquid level float. In the waveguide of the magnetostrictive liquid level sensor, an auxiliary float 3 is added between the waveguide wire and the waveguide, and the distance L between the auxiliary float and the excitation pulse application point 2 in the sensor head is accurately determined 0 , so that when the liquid level sensor is put into the liquid tank for liquid level measurement, the sensor will not only measure the number N of liquid level count pulses corresponding to the liquid level value, but also measure the number N of count pulses of the auxiliary float 0 . Due to the extremely high linearity of the magnetostrictive level sensor, L 0 , N 0 , N and the liquid level distance Lx satisfy the following relationship: Lx=(L 0 / N 0 )·N, where L 0 / N 0 That is...

Embodiment 2

[0015] Such as image 3 , Figure 4 Shown: on the basis of the above-mentioned embodiment 1, the auxiliary float 8 is added at the distance from the first auxiliary float Lo, and the time interval between the return signal and the excitation pulse signal of the two auxiliary magnets is L respectively o1 , L o2 , at this time, the liquid level-time proportional coefficient C 0 =L 0 / (N 02 -N 01 ), and Lx=C 0 ·N. , the double auxiliary float method can overcome the single auxiliary float method, because the position of the auxiliary float and the liquid level float coincides, resulting in the disadvantage of indistinguishable pulse.

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Abstract

The sensor is comprises the wave-guide line, wave-guide tube and liquid level floater etc. The characters are that at least a assistant magnetic floater is added at annular space between the wave guide line and wave guide tube. Determining distance Lo between the assistant magnetic floater and the applying point of exciting pulse in the sensor head, or Determining distance Lo between two adjacentfloaters makes possible to obtain (1) number N of count pulse of floater and (2) number No of count pulse between assistant floater and the applying point of exciting pulse or (3) number No of count pulse between two adjacent floaters. Based on distance Lx=(L0ú»No)íñN, L0ú»No is scale factor C0 of liquid level-time. Thus, the scale factor can be self-calibrated and the measurement error of temperature drift can be canceled. The advantages of the invention are simple structure, high reliability and easy of use.

Description

technical field [0001] The invention relates to a self-calibrating magnetostrictive liquid level sensor capable of eliminating temperature drift, which belongs to the liquid level detection technology. Background technique [0002] The magnetostrictive liquid level sensor uses the Wiedemann effect, Viuary effect and ultrasonic effect of smart materials to achieve ultra-high-precision measurement of liquid level and interface, and its measurement resolution can reach even Better than 0.1mm. In addition, because the magnetostrictive liquid level sensor has almost no moving mechanical parts, it has the characteristics of high reliability, convenient installation and maintenance, and wide application range. It is currently one of the most ideal contact type liquid level measurement devices for large tanks. It has been more and more widely used in refineries, oil depots, oil product terminals and gas stations. [0003] A sensor is a device that converts a physical signal into a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/72G01F23/76
Inventor 李一博靳世久李健陈世利王立坤
Owner TIANJIN UNIV