Temperature measuring method and device for large-scale objects based on quartz temperature sensor

Abstract

The invention discloses a temperature measuring method and a device for large-scale objects based on a quartz temperature sensor. When a quartz temperature measuring set formed by the quartz temperature sensor, an oscillator, a preamplifier, a mixer, a shaping circuit and a fundamental frequency oscillator is adopted for measuring an object temperature, a triode in the mixer is invertedly connected in advance, then an electrical output signal of the preamplifier is connected to a signal input end of the mixer through a signal transmission line longer than 5m, and then the quartz temperature measuring set can be used for measuring the object temperature. The method and the device have the advantages that the structure is simple, the scale range of the measured objects is large, the measuring accuracy and the working reliability are high, and when the signal transmission line is 25m, the error of the measuring accuracy is <=+ / -0.1DEG C.

Description

technical field [0001] The invention relates to a method and device for measuring the temperature of a large-scale object based on a quartz temperature sensor, belonging to the technical field of quartz temperature measuring instruments. Background technique [0002] At present, quartz temperature measuring instruments based on quartz temperature sensors are often used for high-precision automatic measurement of temperature. Since the quartz temperature sensor measures the temperature by using the principle that its resonant frequency is proportional to the temperature, it is necessary to provide an oscillation source for the quartz temperature sensor, and because the relative change between the quartz oscillation frequency and temperature is small, a frequency mixing method is used The method presents valid signals. For a large-scale measured object, to achieve its temperature measurement, the methods commonly used in the prior art are as follows: [0003] 1. Lengthen the...

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Problems solved by technology

Even so, when the signal transmission lead between the integrated front pole and the mixer is too long, its parasitic capacitance is too large, which will stop the front pole from vibrating, so the measurement range of this method is only 1m left and right range;

[0005] 3. The signal processing circuit of the entire temperature measuring instrument is integrated on the probe. Although this can solve the problem of stopping the oscillator by lengthening the lead wire, it will increase the probe volume of the measuring instrument. When using this measuring probe and When the measured object touches, it will change the temperature state of the measured object and make the measured temperature inaccurate

At the same time, due to the large volume of the probe, it is very inconvenient to measure

[0006] From the above analysis, it can be known that the quartz temperature measuring instrument based on the quartz temperature sensor in the prior art is still not ideal for the temperature measurement of large-scale objects.

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