智舌信号的数字滤波设计

Design of digital filter for the signal of Smartongue

智舌是一种新型智能感官分析仪器,它以快速、简便、安全等特点迅速在食品质量与安全、生物、环境等领域得到广泛应用。智舌在检测茶、酒等物质时信号强度高,受背景噪音影响较小,但在检测糖、水等某些弱电解质溶液时,信号十分微弱,受背景噪声干扰明显,直接影响测量值的准度与精度。实验借助LabVIEW开发平台,提出了一种适合智舌检测信号的数字滤波方法。通过对水、蔗糖溶液、绿茶饮料的滤波前后信号比较,证明此方法方便、灵活、可靠,能很好地滤除智舌信号的背景噪声干扰。

Smartongue is a new intelligent sensory-analyzing instrument.With its characteristics of robustness,simplicity and safety,it is widely applied in the fields of food quality and safety inspection,biological and environmental studies.When Smartongue was used for inspecting tea and wine,the signals would be strong and more immune to the background noises.However,when it was used for inspecting sugar,water and other weak electrolytic liquid,the signals would be weak and susceptible to background noise,and thus it would affect the accuracy and precision of the measurement.This article,based on the LabVIEW development platform,aims to propose a digital filtering method,which is suitable for the Smartongue inspection signal.Experiments were conducted on the pre-and post-filtering signals on the tested liquids,such as water,cane-sugar solution and green tea,and it proved that it was convenient,flexible and reliable in filtering the background noise of the signal in Smartongue.