High-precision dew-point instrument provided with dual-optical-path system

Abstract

The invention discloses a high-precision dew-point instrument provided with a dual-optical-path system. The high-precision dew-point instrument comprises a temperature sensing unit, a dual-optical-path detection unit and an observing unit, wherein the temperature sensing unit comprises a temperature sensor, a sensor prefixed amplifying circuit connected with the temperature sensor, an A / D conversion circuit connected with the sensor prefixed amplifying circuit and a nonlinear correction control circuit, wherein a nonlinear correction control system divides an input signal into different sections according to different temperature values and then enables the sections where the input signal is located to multiply by different compensation factors to perform correction. The dual-optical-path detection unit comprises a reflected light measurement module and a scattered light measurement module, wherein the reflected light measurement module and the scattered light measurement module perform measurement simultaneously. The observing unit comprises an observing microscope for observing a mirror plane and facilitating accurate and timely result observing performed by a user. The high-precision dew-point instrument is high in measurement accuracy, more convenient to use and more accurate in measurement.

Description

technical field [0001] The invention relates to a dew point meter, in particular to a high-precision dew point meter with a double optical path system. Background technique [0002] A dew point meter is an instrument that can directly measure the dew point temperature. Let a mirror surface cool down in the humid air of the sample until the moment when dew drops (or ice crystals) appear on the mirror surface, measure the average temperature of the mirror surface, which is the dew (frost) point temperature. It has high humidity measurement accuracy, but it needs a highly polished mirror surface, a high-precision temperature control system, and a highly sensitive dew drop (ice crystal) optical detection system. During use, the pipes that inhale the sample air must be kept clean, otherwise the impurities in the pipes will absorb or release moisture and cause measurement errors. Measurement accuracy is an important performance index of the dew point meter, especially in the pro...

AI Technical Summary

Problems solved by technology

The usual dew point meter, due to the nonlinear offset in the measurement process and the scattering of light, is likely to cause large errors.

At the same time, dew point measurement depends to a large extent on the timely and accurate observation of the measurement personnel. If the observation is not accurate, it will not be able to achieve better accuracy.