Material level and liquid level switch based on microwave detection technology

Abstract

The invention discloses a material level and liquid level switch based on the microwave detection technology. The material level and liquid level switch comprises a microprocessor circuit, a microwave signal generator, a high-frequency power divider, an amplitude and phase discriminator, a sensitivity potentiometer, a display circuit and a control circuit. The microprocessor circuit outputs a 300MHz-2.4GHz variable-frequency signal controlling the output of the microwave signal generator, the variable-frequency signal passes the high-frequency power divider and is divided into two paths, one path is output to an antenna, one path is output to the broadband amplitude and phase discriminator, the signal in the range of the antenna is conveyed to the broadband amplitude and phase discriminator for comparison, the signal output by the amplitude and phase discriminator is sampled and processed by the microprocessor circuit to obtain a processed signal, and the processed signal is respectively transmitted to the sensitivity potentiometer, the display circuit and the control circuit. The material level and liquid level switch has the advantages that various objects can be detected under a noncontact or slight contact condition, misoperation can be avoided even high-viscosity substance adhesion exists, detection error rate is reduced, and detection accuracy and work efficiency are increased.

Description

technical field [0001] The invention relates to the technical field of switch control, in particular to a level switch based on microwave detection technology. Background technique [0002] With the development of the domestic economy and the increasing scale of cities, the current level switches or liquid level switches mainly include capacitive, radio frequency admittance, stirring, and tuning fork types. These level switches or liquid level switches have some disadvantages, for example, they need to be inserted into the measured liquid or powder solid, which is prone to failure. Moreover, it cannot be used in some occasions with high viscosity and easy residue, which is prone to malfunction. [0003] Therefore, a new level switch based on microwave detection technology is needed to solve the above problems. Contents of the invention [0004] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a level switch based on micro...

AI Technical Summary

Problems solved by technology

These level switches or liquid level switches have some disadvantages, for example, they need to be inserted into the measured liquid or powder solid, which is prone to failure

Moreover, it cannot be used in some high-viscosity and easy-to-residue occasions, which is prone to malfunction

Images