A microwave detector and a motion sensor using the detector
A microwave detector and motion sensing technology, applied in the field of motion sensors, can solve problems such as unrealized, and achieve the effects of reducing costs, reducing width, and reducing detection blind spots
Active Publication Date: 2018-08-14
B E A ELECTRONICS BEIJING
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Problems solved by technology
[0014] To sum up, so far, with the advancement of technology, part of the user's needs for sensors have been met, but until now, even with the latest technology, the user's final wish - a sensor that can be installed on the top frame of an automatic door A small sensor in the gap between the automatic door leaf or embedded in the lower edge of the automatic door top frame - not yet implemented
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[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0053] Taking the microwave motion sensor of the automatic door as an example, the working principle of the microwave motion sensor is as follows: figure 1 As shown, the sensor 1 is installed on the front end of the top frame 2 of the sliding automatic door 3, the automatic door has door leaves 3a and 3b, the sensor can generate the main detection field 4, the main detection field 4 faces away from the automatic door and is located on the automatic door In front, the radiation projection range 4a of the detection field 4 on the ground is elliptical. Generally speaking, the width W of 4a needs to be wider than th...
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The invention provides a microwave detector and a motion sensor applied with the microwave detector in order to achieve the requirement of enabling the motion sensor to be small and unviewable as much as possible. The microwave detector comprises a digital read out (DRO) transceiver and a planar antenna. The planar antenna comprises antenna plates connected with microstrip lines. The planar antenna is characterized in that an inclination angle beta' is formed between the central axis of a main probe field and the plane vertical axis of the planar antenna to ensure that the main probe field points to the required detecting direction of automatic equipment; meanwhile, an inclination angle phi' is formed between the central axis of a marginal secondary probe field and the plane vertical axis of the planar antenna to ensure that the marginal secondary probe field is perpendicular to or approximately perpendicular to the automatic equipment, wherein the field angle of the marginal secondary probe field theta' is very small. The microwave detector can obviously lower the size of the motion sensor under normal operating conditions and can be installed on the hiding position of the automatic equipment.
Description
technical field [0001] The invention belongs to the field of sensors and sensing devices, and relates to a microwave detector and a motion sensor using the detector. Background technique [0002] We usually refer to devices used to detect the movement of people or objects in the environment as motion sensors, and general motion sensors use microwave, infrared or laser technology. Among them, the microwave motion sensor detects and senses through the traditional radar principle. The radar principle is the Doppler effect, that is, an oscillator emits microwave radiation lines in a certain frequency range from the antenna to form a detection field, and the microwave radiation lines will Reflected by people or objects in the detection field, the reflection line returns to the antenna along the path of the emission line, and then passes through a mixer to compare the frequency changes of the emission line and the reflection line: if the frequencies of the emission line and reflec...
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IPC IPC(8): G01V3/12
Inventor 菲赫楠·万日尼克唐皮埃尔·盖赫迪赫克里斯蒂安·诺瓦克
Owner B E A ELECTRONICS BEIJING