Threshold value-dynamically-adjustable method for detecting concentration of gas in glass bottles

Abstract

The invention discloses a threshold value-dynamically-adjustable method for detecting the concentration of gas in glass bottles. According to the method, the secondary harmonic peak values P0, Pa and PX of glass bottles under a concentration threshold value 0%, a qualified concentration threshold value a% and a reference concentration auxiliary threshold value X% in the same detection environment are obtained; the absolute values of the difference value of P0 and Pa and the difference value of P0 and PX are calculated, so that Da and Dx are obtained, and P0 is written into a queue of which the length is M; quality detection is performed on each glass bottle to be detected; the secondary harmonic peak value PN of the glass bottles is acquired, and whether a relational expression that PN<=Pa is satisfied is judged; if the relational expression that PN<=Pa is satisfied, the medicine bottles are qualified, otherwise, the medicine bottles are unqualified; if the medicine bottles are qualified, whether a relational expression that PN<=PX is satisfied is judged, if the relational expression that PN<=PX is satisfied, the secondary harmonic peak value of the medicine bottles is written into the queue, and then the average value of the queue is solved, so that PL is obtained; and Pa is updated to be equal to the sum of PL and Da, PX is updated to be equal to the sum of PL and Da; after being updated, Pa and PX are used for the detection of a next medicine bottle. With the threshold value-dynamically-adjustable method for detecting the concentration of gas in the glass bottles of the invention adopted, the interference of environmental factors is eliminated in real time, and detection reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and in particular relates to a method for detecting the gas concentration in a glass bottle with dynamically adjusted threshold value, which is used to identify whether the glass bottle is qualified or not by means of dynamically adaptive gas concentration detection based on the threshold value. Background technique [0002] In the pharmaceutical industry, international companies have applied wavelength modulation spectroscopy (WMS) technology to the detection of oxygen concentration in sealed glass vials, such as LIGHTHOUSE in the United States and Bevitti in Italy. However, due to the influence of optical noise caused by the glass bottle wall, system instrument noise, nonlinear intensity modulation, and random free space temperature and humidity, there are background fluctuations in the second harmonic signal extracted by WMS technology, which affects the accuracy of concentration measurem...

AI Technical Summary

Problems solved by technology

[0003] At present, in the real-time background subtraction nonlinear correction research of spectroscopy technology, Werle et al. proposed the method of collecting the spectral line signal of the background gas first, and then collecting the spectral line absorption signal of the target gas for subtraction, and Persson et al. Linear processing to reduce the influence of the baseline, but the above methods are only suitable for systems with gas absorption cells; the technical methods disclosed by companies such as LIGHTHOUSE and Bevitty need to add standard bottles at intervals on the pharmaceutical production line to detect However, the additional arrangement of standard bottles reduces the productivity of the production line, and there is a difference between the background noise obtained in advance and the background noise of the currently tested drug bottle due to time difference

Images