Online monitoring system of sewage by spectral interference method

Abstract

The invention discloses an online monitoring system of sewage by a spectral interference method. The online monitoring system is characterized by comprising a turbidity monitoring system and a water-suspension / micropetroleum detecting system, wherein the principle of the turbidity monitoring system is embodied on different grey levels of patterns and different resolutions of CCD (Charge Coupled Device) patterns on an area array CCD, so that the proportion of suspensions in turbid water is determined; and the water-suspension / micropetroleum detection determines the suspensions and the content of oil in the water by utilizing frequency spectrum offset generated by light wave penetrating through different water qualities and change of Moire interference fringes generated by different light waves penetrating through standard solution. The online monitoring system disclosed by the invention has the advantages that (1) an advanced detection technology guarantees the accuracy of a measured value and long-time working stability; (2) analysis, user-defined setting and multiple alarming modes and management modes can be carried out on the real measured value; (3) automatic adjustment of the period of a self-cleaning sensor can be realized according to the working condition of a site and the data accuracy is guaranteed.

Description

technical field [0001] The invention relates to the field of sewage monitoring and analysis in special industries, in particular to an online sewage monitoring system by spectral interference method. Background technique [0002] The monitoring of sewage treatment effect in the oil industry mainly monitors the content of suspended solids and trace oil in the treated water. In the prior art, the method of monitoring suspended solids in water, that is, its turbidity, is to use light energy transmission method, and the method of monitoring trace oil content in water is Using the light energy fluorescence reflectance method, the above two monitoring methods are collectively referred to as the light energy method detection technology. [0003] For example, the invention with the application number of 200710300721.4 discloses a visual measurement method and measurement system of an ultrasonic levitation field, which divides the beam emitted by the laser into the first and second t...

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Problems solved by technology

[0004] However, the technical solution disclosed in the above invention cannot solve the technical problems that the monitoring accuracy of this method is easily affected by cepstrum energy attenuation during monitoring, the requirements for optical monitoring devices are high, the resolution is poor, and the stability of long-term online work is poor.

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