Digital absolute code optical fiber liquid level sensor

Abstract

The invention discloses a digital absolute code optical liquid level sensor, comprising an incidence optical fiber, an emergence optical fiber, a shell, an optical base, a light source outside the shell, a photosensitive unit and a SBC signal processing unit, wherein, the incidence optical fiber and the emergence optical fiber stretches into the shell and are respectively arranged in pair at the two ends of the optical base with a groove; a float component moves upwards and downwards followed by the change of the liquid level; a convex baffler of the float component, which is corresponding to the groove of the optical base, follows the liquid level to move and stretches into the groove of the optical base for keeping off the incidence ray of the liquid level incidence optical fiber, thus the emergence optical fiber gets a variation gray code liquid level signal. The resolution and the precision of the invention are decided by the spacing of the optical fiber pair, the physical dimension of the baffler and the form of the coding. The invention can measure the liquid level of various mainly transparent liquid with high precision, and resist electromagnetic interference; the liquid level height information adopts the absolute coding, and no zero-calibration is needed to revert to the measurement after the outage reversion. The invention is particularly applicable to the liquid level measurement of the sloshing liquid surface and under the changeable environment.

Description

technical field [0001] The invention relates to a digital optical fiber liquid level gauge for measuring liquid level in the technical field of measurement and control. More specifically, the present invention is a digital absolute code optical fiber liquid level measurement sensor based on the principle of optical fiber light transmission, which can measure the liquid level of various basically transparent liquids. Stable, reliable and high-precision measurement of the liquid level is carried out under the condition of liquid level sloshing. Background technique [0002] Since the mid-1970s, due to the passive characteristics of the optical fiber sensor, it has no effect on the measured object, anti-electromagnetic interference, high temperature resistance, high pressure resistance, corrosion resistance, and can work normally in harsh environments such as toxic and nuclear radiation. , The optical fiber transmission frequency bandwidth is wide, the dynamic range is large, a...

AI Technical Summary

Problems solved by technology

The measurement results of the method of continuously measuring the liquid level of the optical fiber liquid level sensor and converting the liquid level to pressure are easily affected by changes in liquid density, environmental pressure changes, and long-term drift of the sensor. It is difficult to achieve stable and reliable high-precision measurement, and dynamic situation is difficult to work accurately

It is impossible to implement stable, reliable and high-precision measurement of the liquid level of various basically transparent liquids under the condition of liquid surface sloshing

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