Method for detecting freshness of crab by utilizing electronic nose

Abstract

The invention discloses a method for detecting freshness of crab by utilizing an electronic nose. The method comprises the following steps: (1) putting a to-be-detected crab sample into a sample container, sealing and standing for 30-50min at room temperature; (2) inserting a filtered gas probe of the electronic nose into the sample container, setting time as 40-60s and collecting headspace gas; (3) guiding the gas to enter into a gas sensor array, detecting and analyzing; (4) collecting and storing the related data of the gas through the following specific steps: 1) extracting response characteristic values of the gas sensor array, including an initial value, a stable value, a rise time and a rise speed, 2) in a DSP (Digital Signal Processor) built in the electronic nose, inputting the collected original response characteristic values of the electronic nose to the DSP and calculating an output signal-to-noise ratio spectrum signature value according to a solidifying nonlinear stochastic resonance algorithm, and 3) calculating a freshness value of the crab according to a freshness forecasting model and the signal-to-noise ratio spectrum signature value. The method provided by the invention is simple, convenient, high-speed and effective.

Description

technical field [0001] The invention relates to the technical field of detecting the freshness of crabs, in particular to a method for detecting the freshness of crabs by using an electronic nose. Background technique [0002] Freshness is one of the important criteria for evaluating crab quality. A series of indicators and methods have been developed to evaluate the freshness of crabs, such as sensory evaluation methods, microbiological methods, physical and chemical detection methods, etc., but the above detection methods are difficult to meet the requirements of accuracy, speed, and simple operation, and there is a detection process. The disadvantages are cumbersome, high cost, and time-consuming. [0003] At present, the gas sensors used in electronic noses generally have problems such as baseline drift and poor repeatability, which affect the accuracy of detection results and become an obstacle to the development of electronic nose technology. In addition, traditional...

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Problems solved by technology

[0004] In order to solve the problems of cumbersome process, high cost, long time-consuming, sensor baseline drift, etc. in the existing crab freshness method, the purpose of the present invention is to provide a simple, fast and effective method for detecting crab freshness by using electronic nose

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