Ultrasonic outside pipe pressure detection device and method

Abstract

The present invention relates to an ultrasonic pipe exterior pressure delection equipment and method, including ultrasonic transmitting and receiving card and data collecting card which are based on ISA bus and inserted into the slot of bottom plate of industrial control machine. TRA and TRB of ultrasonic transducer are perpendicularly mounted on ouer pipe wall in 180 deg. and under the control of industrial control machine only the TRA of ultrasonic transducer can be used to transmit the ultrasonic signal, and the TRA and TRB can be used for respectively receiving echo-penetrated ultrasonic signal, said signal can be fed into input end of data collecting card, and analyzed and processed by industrial control machine so as to implement time difference and pressure calcutation.

Description

1. Technical field [0001] The invention relates to an ultrasonic tube external pressure detection device and method, in particular to a small diameter tube external pressure detection device and method. 2. Background technology [0002] The research on non-invasive pressure measurement is in the immature and exploratory stage, and there are two methods, the stress sensing method and the ultrasonic echo displacement method. The stress sensing method is based on the basic principle of radial elastic deformation of metal pipes under the action of liquid pressure. The internal working pressure of the pipe can be calculated by detecting the small deformation of the outer diameter of the pipe. The sensitivity, accuracy and other indicators of this pressure measurement method are all It is very low; the ultrasonic echo displacement method is the first of the Second Artillery Engineering College, which uses the ultrasonic probe as the sensing element according to the physical charac...

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Problems solved by technology

The stress sensing method is based on the basic principle of radial elastic deformation of metal pipes under the action of liquid pressure. The internal working pressure of the pipe can be calculated by detecting the small deformation of the outer diameter of the pipe. The sensitivity, accuracy and other indicators of this pressure measurement method are all It is very low; the ultrasonic echo displacement method is the first of the Second Artillery Engineering College, which uses the ultrasonic probe as the sensing element according to the physical characteristic of the change of the sound velocity of the fluid caused by the pressure change, and the ultrasonic probe emits and receives the reflected echo. The change of fluid pressure is tested by detecting the echo information affected by the change of fluid pressure. This method ignores the influence of temperature and establishes a linear relationship between the echo wave displacement and the pressure change value, so it can only qualitatively reflect the rough Changes in pressure in pipelines (such as hydraulic cylinders), and its time measurement resolution is limited, the measurement accuracy is low, quantitative measurement cannot be achieved, and it is not suitable for small pipe diameter measurement

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