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Study on Portable Mini-Specrometers for Rapid Inspection of Nitrate Concentration in Leafy Vegetable
Non-destructive detection,NIR,mini-spectrometers,Bok choy,Nitrate,
|Publication Year :||2016|
|Abstract:||蔬菜為人類日常飲食中不可或缺之食物，然而蔬菜容易因栽種不當而殘留過多有害健康之硝酸鹽，因此本研究目的為測試以兩台市售小型光譜儀之性能及檢測能力，評估開發小型光譜檢測設備之可行性，期望建立出可快速檢測蔬菜中硝酸鹽濃度之方法，並提供開發低價光譜設備之參考。本研究先以FOSS NIRSystem之方法對三台光譜儀進行Photometric Noise測試，僅實驗室型RCA光譜儀之數據符合FOSS原廠建議值，顯見其穩定性均不及RCA光譜儀。再以實際測量生物材料，並以各式數學處理之光譜形狀比較二者與RCA量測到之主要波峰位置，作為初步判斷光譜儀波長偏移情形之依據。整體顯示A牌之結果皆較B牌優，然而若將價格加入考量數據，則其CP值未必是A牌較佳。
Vegetables are necessary food in human’s daily meals. However, due to improper cultivation, there will be excessive nitrate remained in vegetable, which is harmful to human’s health. As a result, the purpose of this study is to evaluate the possibility of developing a low-priced spectroscopy equipment based on commercial portable mini-spectrometers and establish a method of rapid detection of the concentration of nitrate in vegetables.
In this study, we have tested three spectrometers, including laboratory spectrometer RCA and two mini-spectrometers from company A and company B, for their performance and stability. Spectral signals of biomaterials were measured by using these spectrometers, and the appearances of waveform were regarded as the basis of availability of each spectrometer. The results indicated that the performance of RCA is most stable and followed by company A than company B and only the RCA conforms to the Photometric Instrument Noise inspection from FOSS NIRSystem Inc. However, the CP value of mini-spectrometer of company A might not be better than that of company B after taking their price into account.
During calibration model developing, we adopted the spectral information of self- cultivated Bok Choy leaves which were measured by RCA, spectrometer A (transmission and reflection ways), and spectrometer B. The nitrate concentrations of each Bok Choy were obtained by using chemocolorimetry. PLSR analysis was used to build four calibration models. In the calibration model using RCA, the values of rc and rv could achieve 0.85 and 0.73, and the value of SEC were 1104.96 ppm; in the calibration models using spectrometer A and spectrometer B, the values of rc and rv could achieve 0.81 and 0.68 and 0.71 and 0.48, which showed that these models have enough ability in prediction and they also confirmed the results of performance and stability tests. Moreover, the study also compared the results from different measurement conditions, such as detection ways and the nitrate concentration distribution of data. The result shows the reflectance way is more precise and the large distribution of nitrate can help to build the model stable. Base on the results of comparison of performance between different spectrometers and establishment of calibration models, it can provide a reference for the development of low-price spectroscopy equipment in the future.
|Appears in Collections:||生物機電工程學系|
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