Method and device for nondestructive measuring surface temperature and pressure of cylindrical pressure vessel

Abstract

A nondestructive measuring-method of surface temperature and pressure of cylindrical pressure container includes setting up relation model of Rayleigh wave transition time to pressure container surface temperature and pressure; utilizing measurement unit formed by four Rayleigh wave probe, ultrasonic transceiver circuit, circulation control circuit, time / digit conversion circuit and monolithic computer for calculating out surface pressure and temperature value of pressure container by measuring transition time of Rayleigh wave in transmission distance.

Description

technical field

[0001] The invention relates to a nondestructive measurement method and device for surface temperature and pressure of a cylindrical pressure vessel. Background technique

[0002] Cylindrical pressure vessels have been widely used in petrochemical, energy, light industry, metallurgy and other modern industrial production processes. In order to ensure the normal operation of industrial production, it is often necessary to monitor the surface temperature and pressure of pressure vessels at any time.

[0003] Rayleigh waves are two-dimensional elastic surface waves that propagate along the surface of a material. It can not only be used as a medium for non-destructive testing, but also sensitively reflect information such as stress and temperature inside the material. According to the characteristics of Rayleigh wave velocity and the stress borne in the transmission medium, a model of ultrasonic pressure measurement can be established, and then the non-destructi...

Examples

Embodiment Construction

[0024] Such as figure 1 Shown is a schematic diagram of a cylindrical pressure vessel to be tested. Ultrasonic wave velocity is affected by both stress and temperature. According to this principle, the relationship between wave velocity change and container pressure and temperature can be established. However, the speed change itself cannot be directly measured, and the present invention converts the change of wave speed into the change of ultrasonic propagation time. The propagation time of Rayleigh wave is equal to the ratio of propagation distance to propagation velocity, so the influence of temperature and pressure on Rayleigh wave propagation distance and velocity must be considered at the same time.

[0025] 1) Effect of temperature and stress on wave velocity

[0026] Set the pressure to 0 and the temperature to a specific temperature T o The state at that time is the initial state. Compared with the initial state, the current state has changed in both temperature a...

technical field

[0001] The invention relates to a nondestructive measurement method and device for surface temperature and pressure of a cylindrical pressure vessel. Background technique

[0002] Cylindrical pressure vessels have been widely used in petrochemical, energy, light industry, metallurgy and other modern industrial production processes. In order to ensure the normal operation of industrial production, it is often necessary to monitor the surface temperature and pressure of pressure vessels at any time.

[0003] Rayleigh waves are two-dimensional elastic surface waves that propagate along the surface of a material. It can not only be used as a medium for non-destructive testing, but also sensitively reflect information such as stress and temperature inside the material. According to the characteristics of Rayleigh wave velocity and the stress borne in the transmission medium, a model of ultrasonic pressure measurement can be established, and then the non-destructi...

Examples

Embodiment Construction

[0024] Such as figure 1 Shown is a schematic diagram of a cylindrical pressure vessel to be tested. Ultrasonic wave velocity is affected by both stress and temperature. According to this principle, the relationship between wave velocity change and container pressure and temperature can be established. However, the speed change itself cannot be directly measured, and the present invention converts the change of wave speed into the change of ultrasonic propagation time. The propagation time of Rayleigh wave is equal to the ratio of propagation distance to propagation velocity, so the influence of temperature and pressure on Rayleigh wave propagation distance and velocity must be considered at the same time.

[0025] 1) Effect of temperature and stress on wave velocity

[0026] Set the pressure to 0 and the temperature to a specific temperature T o The state at that time is the initial state. Compared with the initial state, the current state has changed in both temperature a...

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