Ultrasonic wave receiving module, detecting system as well as detecting method and physical camera thereof
A receiving module and ultrasonic technology, applied in radio wave measurement systems, measurement devices, re-radiation of sound waves, etc., can solve problems such as wrong detection results and short distances to be measured
Inactive Publication Date: 2013-03-27
AVER INFORMATION INC
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Problems solved by technology
On the other hand, in the actual measurement environment, in addition to the reflected wave r reflected from the object 16 to be measured, there are still many interfering signals, such as crosstalk noise c due to the phenomenon of crosstalk
When performing short-distance measurement, the distance to be measured is relatively short, and the reflected wave r reflected by the object 16 to be measured will overlap with the crosstalk noise c, resulting in false detection results
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[0046] Please refer to figure 2 , which shows a block diagram of an ultrasonic detection system 100 according to an embodiment of the present invention. The ultrasonic detection system 100 includes an ultrasonic transmitter 110 and an ultrasonic receiver module 120 .
[0047] The ultrasonic transmitting end 110 is connected to a signal generator 112 . The signal generator 112 can generate ultrasonic signals, and then radiate into space through the ultrasonic transmitting end 110 . For the convenience of reading, the ultrasonic signal sent by the ultrasonic transmitting end 110 is referred to as the first ultrasonic signal hereinafter.
[0048] Figure 3A to Figure 3C A line graph showing ultrasonic signals, preset magnifications, and thresholds versus time. Please also refer to figure 2 and Figure 3A . In an embodiment of the present invention, the ultrasonic transmitting end 110 is at the first time t 1The first ultrasonic signal f(t 1 ) into the air.
[0049] Th...
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The invention discloses an ultrasonic wave receiving module, a detecting system as well as a detecting method and a physical camera thereof. The ultrasonic wave receiving module comprises an ultrasonic wave receiving end, a signal amplifier and a detecting module. The ultrasonic wave receiving end receives at least one of ultrasonic signal, and the signal amplifier is electrically connected with the ultrasonic wave receiving end and changes the vibration amplitude of the received ultrasonic signals with a preset rate, wherein the preset rate is increased along with the increase of time. The detecting module is electrically connected with the signal amplifier and captures a part of ultrasonic signals with the vibration amplitude greater than a threshold value through the threshold value, wherein the threshold value is reduced along with the increase of the time.
Description
technical field [0001] The present invention relates to an ultrasonic detection device and method, and in particular to a device and method for detecting distance using ultrasonic waves. Background technique [0002] With the development of industrial technology, the demand for automatic ranging system is increasing day by day. For example, the parking of vehicles, the operation of unmanned vans, and the application of space positioning systems often use automatic ranging systems to enable cars to be parked in fixed areas smoothly and unmanned vans to quickly move goods to predetermined locations. location without being disturbed by other obstacles. [0003] Traditionally, the ranging system uses ultrasonic waves as the distance measuring medium (Media), and uses the reflected ultrasonic waves to detect the distance of objects through the air as the transmission medium. [0004] Figure 1A and Figure 1B Both are schematic diagrams of a traditional reflective ultrasonic r...
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IPC IPC(8): G01S7/52G01S15/32G01C11/36
Inventor 罗一中陈志明徐俊凯
Owner AVER INFORMATION INC