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Small dead zone ultrasonic wave sensor

An ultrasonic and sensor technology, applied in the field of ultrasonic sensors in small blind areas, can solve the problem that the signal cannot be captured

Inactive Publication Date: 2015-04-29
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] ②When the MCU sends the pulse train, if the time required to send the pulse train is , then in the shorter The receiving timer may not have started counting within the time limit. If the target is very close, the ultrasonic signal has been reflected back, but the signal cannot be captured

Method used

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Embodiment Construction

[0027]specific implementation plan

[0028] The present invention is further described below through specific embodiments, but the present invention is not limited only to the following examples.

[0029] Such as figure 1 As shown, a small blind zone ultrasonic sensor includes a main control chip 1, a temperature measuring element 2, a transmitting circuit 3 and a receiving circuit 4, and the temperature measuring element 2, transmitting circuit 3 and receiving circuit 4 are respectively connected to the main control chip 1, The model of described main control chip 1 is DSPIC30F5011, and described temperature measuring element 2 is copper resistance Cu5, and the model of main control chip 1 is DSPIC30F5011, and described temperature measuring element 2 is the use connection method of copper resistance Cu5 is known There is nothing special about the technology, so it will not be introduced here.

[0030] Such as figure 2 As shown, the transmitting circuit 2 includes a resi...

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Abstract

The invention relates to the field of electronic sensors, in particular to a small dead zone ultrasonic wave sensor. The small dead zone ultrasonic wave sensor comprises a main control chip, a temperature measuring element, an emission circuit and a receiving circuit, wherein the temperature measuring element, the emission circuit and the receiving circuit are each connected with the main control chip; the small dead zone ultrasonic wave sensor is simple in structure; the range of a dead zone of a system is 5 cm; when the dead zone of the system ranges from 10 cm to 60 cm, an error is smaller and the measuring error is 0; when the dead zone of the system ranges from 60 cm to 500 cm, the error is larger and the error is 1-3 cm; due to the influence of the mass of the ultrasonic wave sensor, the system can only measure distance within 5 cm; meanwhile with the increasing of measuring distance, the error is increased gradually, the error can be basically controlled less than 2%, and the precision is higher.

Description

technical field [0001] The invention relates to the field of electronic sensors, in particular to an ultrasonic sensor with a small blind zone. Background technique [0002] In general, the absorption of ultrasonic waves by air is proportional to the square of the ultrasonic frequency, so the frequency of ultrasonic waves used for distance measurement cannot be very high; on the other hand, the lower the frequency of ultrasonic waves and the longer the wavelength, the greater the absolute error of distance measurement , Therefore, the range increase of the distance measurement and the measurement accuracy are actually a pair of contradictions. Under the same environment, temperature, humidity and other conditions, the sound absorption of 10kHz sound waves in the air is about 0.26dB / m. According to the relationship between the absorption and the square of the frequency, the sound absorption of ultrasonic waves with a frequency of 20kHz in the air is estimated. It is about 1d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/93G01S7/523
CPCG01S15/93G01S7/523
Inventor 赵凯
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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