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A detection terminal including a piezoelectric transducer fixed on a diaphragm

A technology of piezoelectric transducers and detection terminals, which is applied in traffic flow detection, radio wave measurement systems, instruments, etc., and can solve problems such as huge stress on detection components, unsuitable detection terminals for detection components, etc.

Active Publication Date: 2019-09-24
IEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In both cases, the detection part is not suitable for the detection of the terminals, which are subjected to enormous stresses when the wheels of motor vehicles pass by, and the plates of snowplows are involved, especially in areas where parking is alternately parked on both sides of the road every day for snow removal

Method used

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  • A detection terminal including a piezoelectric transducer fixed on a diaphragm
  • A detection terminal including a piezoelectric transducer fixed on a diaphragm
  • A detection terminal including a piezoelectric transducer fixed on a diaphragm

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Embodiment Construction

[0034] exist figure 1 Among them, the detection terminal according to the first embodiment includes a piezoelectric transducer 1 that emits and receives ultrasonic waves 2 through a diaphragm 3 , and the piezoelectric transducer is fixed on the diaphragm, for example, by pasting. The membrane 3 is received in the opening 5 of the casing 7 buried in the soil 8 . In this arrangement, the membrane 3 is located at the surface 6 of the soil.

[0035] The housing 7 houses various electronic components not shown, such as a microprocessor, possible magnetic sensors, batteries and a radio antenna.

[0036] Figure 8 The mechanism by which ultrasonic waves are formed and then received is represented in an exaggerated manner. The piezoelectric transducer and its diaphragm 3 fixed (glued) on the structure 11 are seen from the figure. The left figure shows a positively curved membrane, ie a positively curved membrane with a central rise 41 which is transferred onto the upper part of th...

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Abstract

A detection terminal including a piezoelectric transducer emitting and receiving ultrasound waves via a diaphragm to which it is secured, said diaphragm being arranged opposite an opening of a housing and connected to said housing by connection mechanism. According to the invention, the diaphragm is connected to a rigid structure which enables same, when subjected to pressure, to undergo a contraction limited to the space provided for said purpose, in the opening of the housing, determined by a position of the structure abutting against a surface of the housing opposite the opening.

Description

technical field [0001] The invention relates to a detection terminal for detection of a parked motor vehicle for the purpose of monitoring compliance with parking regulations and / or as a basic element for use as a motor vehicle guidance device. Background technique [0002] In recent years, automatic motor vehicle detection terminals embedded in roads have appeared on the market, which transmit occupancy information by radio to management devices. These terminals initially used changes in the earth's magnetic field generated by motor vehicles as detection criteria. However, the reliability of this technology is limited. When the parking place is inclined or there are large motor vehicles such as buses or trucks near the monitored parking place, the reliability of this technology is about 95%, and the reliability of the technology is about 95% when the terminal is in a tram, The technique becomes highly random when near subway or power lines. [0003] To overcome these disa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01F11/00G10K9/22G10K11/00
CPCE01F11/00G10K9/22G10K11/004G08G1/0116G08G1/0129G08G1/02G08G1/149G01S15/04
Inventor E·梅努M·德米埃尔
Owner IEM