Inductance-type flow meter measuring converter

Abstract

The invention provides an inductance-type flow meter measuring converter, which is characterized in that two circuits of sinusoidal carrier signals with phase difference of 180DEG are generated by a two-phase carrier generation circuit, the carrier signals act on an inductance-type flow meter sensitive element, the inductance variation frequency of an inductance flow meter is modulated onto one carrier, then a modulation signal is amplified through a modulation signal amplification circuit, a modulation signal detection circuit is used for carrying out the single-side envelope detection for the output signal of the modulation signal amplification circuit, a delay comparison circuit is used for comparing the voltage of the output signal of the modulation signal detection signal to form a square signal, a signal level conversion circuit is used for converting the level of the output signal of the delay comparison circuit, and the signal can be converted into a pulse signal collected by a digital circuit through waveform amplification and shaping standardization. Due to the adoption of the inductance-type flow meter measuring converter, the bridge-type measuring principle which is ordinary adopted by traditional inductance-type sensor can be abandoned, and a transformer is no longer used as one part of a measurement circuit, so that the size, the weight and the power consumption of the circuit can be greatly reduced.

Description

technical field [0001] The invention relates to an inductive flowmeter that can be widely used in the fields of automobiles, aviation, aerospace, petroleum, etc., and can also be used in the occasion where the inductive sensor is used to measure the rotational speed of the engine and the rotational speed of the motor to convert the signal of the inductive flowmeter A new type of inductive flowmeter measurement converter. Background technique [0002] Flow measurement plays a pivotal role in industry, agriculture and people's daily life, and flowmeters are widely used as flow measuring instruments. Now there are more than 100 types of flowmeters, and different flowmeters are used for different occasions and measurement media. There are many kinds of flow measurement methods and instruments, and there are many classification methods. So far, there are as many as 60 types of flow meters available for industrial use. The most extensive classification method today divides flow...

AI Technical Summary

Problems solved by technology

At present, the traditional inductive flowmeter generally adopts the bridge measurement principle, and uses a transformer as a part of the measurement circuit. The size, weight and power consumption of the circuit are relatively large, which is not conducive to the miniaturization of the measurement circuit.

The measurement circuit of the traditional measurement does not have the function of self-detection, and the self-test of the circuit and the online detection of the sensor cannot be realized.

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