Microwave sensor installed in a concealed manner and noise suppression method thereof

Abstract

For the defects in the prior art, the invention provides a microwave sensor installed in a concealed manner. The microwave sensor installed in the concealed manner comprises a housing and a microwave sensor. Through a special housing design method, the escalator microwave sensor ensures big enough detection region, and meanwhile, reduces false triggering probability of the product. The microwave sensor comprises a microwave antenna, a signal frequency-selection filtering amplification circuit unit, a processor, a power supply module and a control module. The microwave antenna adopts a planar antenna, and signals obtained through detection are transmitted to the processor through the signal frequency-selection filtering amplification circuit unit; the processor analyzes and judges movement tendency of a moving object, then, forms a control instruction and sends the control instruction to the control module; the control module controls an external device to move according to the obtained control instruction; and the power supply module provides power for each module. The advantages are that the microwave sensor can be installed in the concealed manner in an escalator in a complex full-metal panel structure, and the whole escalator entrance region can be detected completely through only one microwave sensor.

Description

technical field [0001] The invention belongs to the technical field of automatic sensor control, and in particular relates to a concealed installation microwave sensor and a noise suppression method thereof. Background technique [0002] Escalators are very common and indispensable automatic equipment in people's daily life. However, the power consumption of escalators is relatively large when they are running at full speed. When no one is on the escalator, the escalator is still running without load, which consumes a lot of energy. In order to realize the demand of green energy saving, it is required that when no one takes the escalator, the escalator will automatically switch to the idle energy-saving mode or the stop mode; when the human body is detected to be close to a certain area of ​​the escalator, the escalator will automatically switch to the full-speed operation mode in advance. In this way, a specific sensor device needs to be installed at the entrance of the esc...

AI Technical Summary

Problems solved by technology

[0014] like figure 1 As shown, the existing hidden installation microwave detection device can well solve the problem of the overall aesthetics of the escalator, but when it is installed inside the escalator cavity with a full metal panel structure, the microwave will undergo complex reflection and superposition in the inner space of the escalator

When the escalator is started, the mechanical movement and vibration inside the escalator will cause the Doppler effect, which is Doppler interference noise, which reduces the signal-to-noise ratio and stability of the microwave sensor and interferes with the microwave sensor normal operation, even false detection occurs

In this regard, the general solution is to reduce the sensitivity of the product, resulting in a significant reduction in the detection area of ​​conventional microwave sensors

The existing solutions basically use two sensors to work together to achieve the purpose that the detection area can completely cover the entrance area of ​​the escalator, which increases the price cost and installation and commissioning time cost

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