{"id":1,"date":"2020-06-22T09:42:45","date_gmt":"2020-06-22T09:42:45","guid":{"rendered":"https:\/\/contrologic.co.th\/web\/?p=1"},"modified":"2021-05-13T08:40:06","modified_gmt":"2021-05-13T08:40:06","slug":"refractometer","status":"publish","type":"post","link":"https:\/\/contrologic.co.th\/web\/th\/news\/refractometer\/","title":{"rendered":"Refractometer: Digital Measurement Principle"},"content":{"rendered":"\r\n<p class=\"p1\"><span class=\"s1\">The light source sends light to the interface between a prism and the process solution, where the rays meet the surface at different angles. Depending on the angle, some rays undergo a total internal reflection. The rest of the light is refracted into the process solution.<\/span><\/p>\r\n<p class=\"p1\"><span class=\"s1\">This angle is a function of the refractive index and therefore the concentration of the solution. A CCD-camera detects the optical image. The image is transformed point-by-point into a digital signal. Digital signal processing is used to locate the exact shadow line position and to determine the refractive index nD.<\/span><\/p>\r\n<p class=\"p1\"><span class=\"s1\">A built-in temperature sensor measures the temperature T on the interface of the process liquid. The sensor converts the refractive index nD and temperature T into Brix units.<\/span><\/p>\r\n<p class=\"p1\"><span class=\"s1\">The diagnostics program ensures that the measurement is reliable.<\/span><\/p>\r\n<p class=\"p1\"><span class=\"s1\">Thus, an optical image with a dark sector and a light sector is created. The angle corresponding to the shadow line is called the critical angle of total internal reflection.<\/span><\/p>\r\n<p class=\"p1\"><span class=\"s1\">The light source emits light at the inter\u00adface, between a prism and the process solution, where the rays meet the surface at different angles.Depending on the angle, some rays undergo a total internal reflection. The rest of the light is refracted into the process solution. Thus an optical image with a dark sector and a light sector is created. The angle corresponding to the shadow line is called the critical angle of total internal reflection. This angle is a func\u00adtion of the refractive index and therefore the concentration of the solution. A CCD-camera detects the optical image. The image is transformed point-by-point into a digital signal. Digital signal processing is used to locate the exact shadow line position and to deter\u00admine the refactive index nD.<\/span><\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>The light source sends light to the interface between a<\/p>\n","protected":false},"author":1,"featured_media":6067,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Refractometer: Digital Measurement Principle - Contrologic<\/title>\n<meta name=\"description\" content=\"The light source sends light to the interface between a prism and the process solution, where the rays meet the surface at different angles. 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