Search

This paper uses a single fiber bragg grating (FBG) sensor to implement an experiment to measure vibration and temperature signals at the same time, and proposes a MATLAB-based decoupling method to separate vibration and temperature signals. The experimental results show that under the condition of single signal measurement, the static temperature measurement error of the FBG sensor is within ±0.4 ℃ and the relative error of the dynamic measurement of the main frequency of vibration is 0.5%. The FBG sensor measures the composite signal of vibration and temperature. The relative error of the main vibration frequency obtained by the decoupling method proposed in this experiment is 0.65%, the relative error of the vibration amplitude is 7.14%, and the temperature signal error is within ±3.3 ℃.

ObjectiveTo establish a real-time polymerase chain reaction (PCR) rapid detection method for Pangasius bocourti-derived components.MethodsPrimers were designed according to the mitochondrial cytb gene sequence of Pangasius bocourti, and real-time PCR was used for amplification to achieve the purpose of rapid detection of products.ResultsThis method had good specificity, and the sensitivity could reach 10-4 ng Pangasius bocourti DNA. Pangasius bocourti cytb gene could be detected in fish products mixed with rice noodles, sesame powder, chicken powder and atlantic cod meal, and the sensitivity could reach 0.01%.ConclusionThis method had high specificity, short time and high sensitivity, and could meet the detection requirements of Pangasius bocourti adulteration in fish meat products.