Radiation-proof inductive speed sensor

Abstract

The invention provides a radiation-proof inductance type rotating speed sensor and aims to provide a rotating speed sensor with convenient installation and dismounting, safe and realiable working, high conversion precision and the avoidance of ray damage. The radiation-proof inductance type rotating speed sensor is realized through the following technical scheme: one end of a cable component is axially fixed to a control box through a plug component and a socket, the other end of the cable component is connected to a rotation number measurement probe, W is the critical air gap of the rotation number measurement probe as a working air gap, output is a critical inductance value Ha of 4.85mH to 4.95mH, the measured rotation number of fixed shaft rotation is reflected, the control box obtains the inductance signal of the measured rotation number by using a radiation resistant cable, the signal is transmitted to the detection circuit through the cable component, and the detection circuit distinguishes the inductance signal according to a conversion critical point. When the inductance value H is larger than or equal to Ha, the signal is converted into a low level signal through a level conversion circuit, otherwise the signal is converted into a high level signal. A frequency measurement circuit counts electric impluses through a microprocessor, the converted frequency number is changed as a rotation speed to be outputted from an output interface.

Description

technical field [0001] The invention relates to a sensor mainly used for measuring the rotational speed of a fixed-axis rotating object with a measuring range of 30r / min to 3000r / min, especially an inductive rotational speed sensor with radiation damage near the measured object. The sensor is used for radiation damage. environment. Background technique [0002] In the prior art, there are many inductive sensors for measuring the rotational speed in China, and the principle of the inductive rotational speed sensor is similar to that of the magnetoelectric rotational speed sensor. They are all composed of coils, iron cores, and magnets, or integrated into chips, or made into thick films, or made into combinations, etc., and all use the principle of electromagnetic induction to achieve speed measurement. It is a sensor that converts the measured mechanical quantity, such as angular displacement, periodic pressure change, etc., into magnetic induction change. Its sensitive par...

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Problems solved by technology

However, the inductance chip type is not suitable for places where neutron radiation is serious. For the latter two types, the output frequency and output voltage analog amplitude are affected by the rotational speed, and the signal processing is more difficult.

As mentioned above, the use of chip-type speed sensors such as Hall sensors is not suitable for places where neutron radiation is severe, and the latter two types of generator principle type or transformer principle type, the output frequency and output voltage analog amplitude are affected by the speed Influence, there will be some problems in signal acquisition under the condition of low speed, such as signal and interference amplitude are equal, due to the long signal line to avoid radiation (such as neutron radiation), the signal is also susceptible to interference

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