Multifunctional pressure chamber for realizing image measurement and temperature control

Abstract

The invention relates to a multifunctional pressure chamber for realizing image measurement and temperature control, a pitch sample is put on a sample base, a linear bearing is cooperated with a pressure rod, and the pressure rod uniformly transmits the force to the pitch sample through a sample cap. Tempered glass is fixed in a tempered glass fixed plate to form a visible window, and a camera shoots the experimental variation on whole surface of the pitch sample through the visible window; an illuminating lamp provides stable illumination; two mirrors are fixed to a mirror bracket behind the pitch sample, the mirror bracket is adjusted, and the two mirrors form an angle of 120 degrees. A heating wire is fixed in a pressure chamber cavity, and hot water is added; a temperature sensor is fixed to an upper plate of the pressure chamber cavity, a probe of the sensor suspends in the pressure chamber cavity to directly measure the water temperature, a water temperature value is fed back to the heating wire through an outside PID control system, and the water temperature is controlled. According to the invention, the experimental sample whole surface observation can be realized through the visible window, the water temperature control is realized, and the temperature error in the measurement process is small; and the chamber has advantages of low cost, simple structure and high experimental accuracy.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a multifunctional pressure chamber capable of image measurement and temperature control. Background technique [0002] The triaxial instrument is the most common type of geotechnical experimental equipment in the field of geotechnical testing. Its components can be divided into confining pressure control system, axial pressure system, and measurement system. The cylindrical shape is used to observe the entire surface of the sample, and multiple cameras must be used to observe at the same time, which greatly improves the accuracy requirements of the measurement system and causes high costs; on the other hand, it affects the confining pressure control system. The pressure chamber is only suitable for low confining pressure. The measurement system can also include a temperature control control system. The existing temperature control control system, that is, the temperature control p...

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Problems solved by technology

[0002] The triaxial instrument is the most common type of geotechnical test equipment in the field of geotechnical testing. Its components can be divided into confining pressure control system, axial pressure system, and measurement system. The measurement system can include an image measurement system. Conventional pressure chambers usually use transparent circular Cylindrical, to achieve the observation of the entire surface of the sample, and multiple cameras must be used to observe simultaneously, which greatly increases the accuracy requirements of the measurement system and causes high costs; on the other hand, it affects the confining pressure control system. The pressure chamber is only suitable for low confining pressure

And in the adjustment process to overcome the error, oscillation or even instability may occur. The reason is that due to the presence of large inertial components (links) or lag (delay) components, they have the effect of suppressing errors, and their changes always lag behind the error. The change

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