FUNCTIONAL WATER CONCENTRATION SENSOR

• Main Authors: NAKAGAWA TAKASHI, WATABE YOSHIFUMI, NAGATANI YOSHITADA
• Format: Patent
• Language: English; Japanese
• Published: 08.02.2018
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a functional water concentration sensor having high detection accuracy over a long period without maintenance.SOLUTION: A functional water concentration sensor 1 comprises: a container 10; a light source 20 for emitting ultraviolet light 3 that includes light of a first wavelength and light of a second wavelength; a first filter 31 for transmitting the light of the first wavelength; a second filter 32 for transmitting the light of the second wavelength; a phosphor 40 excited by a first ultraviolet light 4a having passed through (i) functional water 2 and the first filter 31 or a second ultraviolet light 4b having passed through the functional water 2 and the second filter 32, for emitting first fluorescence 5a or second fluorescence 5b; a light-receiving element 50 for receiving the first fluorescence 5a or the second fluorescence 5b and thereby outputting a first light receiving signal or a second light receiving signal; and a signal processing circuit 70 for comparing the first light receiving signal with the second light receiving signal and thereby calculating the concentration of a function appearance component of the function water 2. The absorption level of light of the second wavelength by the function appearance component is smaller than the absorption level of light of the first wavelength by the function appearance component.SELECTED DRAWING: Figure 1A 【課題】メンテナンスを行わなくても長期間にわたって高い検出精度を有する機能水濃度センサを提供する。【解決手段】機能水濃度センサ１は、容器１０と、第１波長の光及び第２波長の光を含む紫外光３を発する光源２０と、第１波長の光を透過させる第１フィルタ３１と、第２波長の光を透過させる第２フィルタ３２と、（ｉ）機能水２と第１フィルタ３１を通過した第１紫外光４ａ、又は、機能水２と第２フィルタ３２とを通過した第２紫外光４ｂによって励起されて第１蛍光５ａ又は第２蛍光５ｂを発する蛍光体４０と、第１蛍光５ａ又は第２蛍光５ｂを受光することで第１受光信号又は第２受光信号を出力する受光素子５０と、第１受光信号と第２受光信号とを比較することで、機能水２の機能出現成分の濃度を算出する信号処理回路７０とを備え、機能出現成分による第２波長の光の吸収レベルは、機能出現成分による第１波長の光の吸収レベルより小さい。【選択図】図１Ａ