Relevant method for improving signal-to-noise ratio of passive nucleon level gage

Abstract

The invention relates to the technical field of measurement of passive nucleon levels, in particular to a method for improving the signal-to-noise ratio of a passive nucleon level gage. According to the method, a passive nucleon level measuring device and a calculation technology are provided. The method comprises the following steps that: (a) the passive nucleon level measuring device is provided with two gamma ray detectors, one gamma ray detector is used for monitoring the variable quantity of gamma ray radioactive intensity inside a detected container, and the other gamma ray detector is used for monitoring the variable quantity of environmental gamma ray radioactive intensity outside the detected container; and (b) the variable quantity of the environmental gamma ray radioactive intensity is deducted from the variable quantity of the gamma ray radioactive intensity inside the detected container to eliminate influences of environmental gamma rays and improve the signal-to-noise ratio. By the method, the variable quantity of the environmental gamma rays is included in influence factors and is eliminated, so that the measurement accuracy is improved; and three interchangeable methods are provided, so that influences of the environmental gamma rays on the gamma ray detectors for measuring nucleon levels inside the detected container are eliminated, the selectivity is improved, and the reliability of increased data can be inspected.

Description

[technical field] [0001] The invention relates to the technical field of passive nuclear material level measurement, in particular to a method for improving the signal-to-noise ratio of a passive nuclear material level gauge. [Background technique] [0002] In chemical industry, metallurgy, coal, electric power and other industries, in the process of conveying materials, it is often necessary to measure the material level in hoppers and silos. [0003] There are mainly two existing methods for measuring material level by using gamma rays: one is a traditional nuclear material level gauge with a radioactive source, such as an automatic material level control device disclosed in the domestic patent CN202230393. The symmetrical gamma ray column measures the material level in the level bin; the other is a non-radioactive nuclear level gauge that uses the natural gamma rays of the measured material and the environment to measure the material level without a radioactive source. ,...

AI Technical Summary

Problems solved by technology

The domestic patent CN200610118890 and the domestic patent CN201010296383 disclose a passive nuclear material level measuring device, both of which use the radiation shielding body added outside the detector to shield the influence of radiation in the environment and reduce the environmental radiation irrelevant to the change of material level , so as to improve the signal-to-noise ratio, but it cannot fundamentally eliminate the influence of changes in environmental rays on the measurement of material level

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