Tuning fork type self-oscillation sensor system

Abstract

The invention discloses a tuning fork type self-oscillation sensor system. When the density of fluid flowing through the tuning fork vibrating body is changed, the resonant frequency of the tuning fork vibrating body is changed, a changed resonant signal is amplified and modulated through the amplification branch, and a formed driving signal drives the tuning fork vibrating body to vibrate through the signal driving circuit, so that a self-oscillation circuit is formed. According to the linear relation between the frequency change of the tuning fork vibrating body and the density of the liquid, the detection circuit detects the frequency change of the tuning fork vibrating body to accurately calculate the density of the fluid at the moment, and meanwhile, the tuning fork vibrating body adopts a high-temperature crystal, so that the tuning fork vibrating body can generate a stable signal in a high-temperature environment; and the accurate measurement of the density of the underground fluid is ensured.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a tuning fork type self-oscillating sensor system. Background technique [0002] Density is an important physical property of liquids. Measuring liquid density is one of the important means to achieve product quality control in many industries such as medicine, food, petrochemical and so on. In a normal temperature environment, a resonant liquid density measurement sensor is usually used to detect the liquid density in the well. The resonant liquid density measurement sensor not only has a simple structure, small size, light weight, and low wear, but also has high reliability, high measurement accuracy, and high efficiency. , Fast response. [0003] However, during oil and gas exploration, due to the influence of factors such as downhole high temperature and high pressure, and the complex structure of the vibrating string method of the resonant liquid density mea...

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a tuning fork type self-oscillating sensor system to solve the problem that the frequency and amplitude of the resonant liquid density measurement sensor are affected by downhole high temperature and high pressure during oil and gas exploration. A certain deviation will eventually affect the measurement accuracy of the instrument

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