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Method and device for measuring flight time of ultrasonic echo

A technology of ultrasonic echo and time-of-flight, which is applied in the fields of laser ranging, radar ranging or front-end electronics, and high-energy physics. It can solve the problems of increasing the complexity of the readout coding circuit and achieve high time measurement accuracy.

Inactive Publication Date: 2010-02-24
TSINGHUA UNIV
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Problems solved by technology

Another improvement method is to subdivide the fixed delay unit through a delay-locked loop, which can achieve a minimum quantization resolution of 80ps at an 80MHz clock, but this structure increases the complexity of the readout encoding circuit

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  • Method and device for measuring flight time of ultrasonic echo
  • Method and device for measuring flight time of ultrasonic echo
  • Method and device for measuring flight time of ultrasonic echo

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Figure 6 Shows the structure of ultrasonic echo time-of-flight measuring equipment according to a preferred embodiment of the present invention, the measuring equipment is mainly composed of three parts, the first part is the signal transceiver part 601, which is responsible for the transmission, reception, channel switching and timing of ultrasonic signals Functions such as control and received signal preprocessing; the second part is the digital signal processing part 602, which is responsible for digital-to-analog conversion of the signal, and then performs digital filtering, denoising, enhancement, edge tracking and other processing, and completes the ultrasonic time-of-flight measurement function; The third part is the human-computer interaction part 603, which is responsible for the control of human-machine interfaces su...

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Abstract

The invention discloses a method and a device for measuring a flight time of ultrasonic echo. The method is performed in the manner of layering time and interpolating. The time measuring range is expanded by adopting the direct counting method in a first layer. The time delay interpolation method is adopted in a second layer. A bran-new two-dimensional matrix manner is adopted on a topological structure. A timing quantization error of the flight time to be measured is further subdivided into two layers. The length of a delay line is shortened so the linear of the delay line is increased. The ps level resolution ratio limitation is broken through because a cursor delay line structure is adopted at 2-2nd Level. For realizing the method, the invention further provides a set of measuring device which comprises a signal receiving and sending part, a digital signal processing part and a man-machine interaction part. The measuring result precision of flight time can be promoted.

Description

technical field [0001] The invention relates to a method and equipment for measuring ultrasonic echo flight time in an ultrasonic flowmeter, which can be applied to the fields of instrumentation, high-energy physics, laser ranging, radar ranging, or front-end electronics. Background technique [0002] Ultrasonic flowmeter is a new type of flow meter that uses the flow velocity information of the fluid contained in the ultrasonic signal to propagate in the fluid to calculate the fluid flow rate. It has the characteristics of non-contact measurement, high measurement accuracy, wide measurement range, and convenient installation and maintenance. It is especially suitable for the measurement of temporary pipeline flow, large diameter pipeline flow and dangerous fluid flow. According to the ultrasonic flow measurement equation, the flow calculation is directly related to the geometric size of the pipeline and the fluid velocity, and the fluid velocity is proportional to the fligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66
Inventor 王伯雄张金罗秀芝崔园园刘涛
Owner TSINGHUA UNIV
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