| 摘要 |
<p>PURPOSE:To decrease an error in measurement due to the influence of external light be detecting variation in light reflection factor through a base body by the chemical material sensor which detects and determines a chemical material and forming a protection film which has a light cutting function on the opposite side of a sensor film from the base body. CONSTITUTION:The sensor film 12 is formed on the transparent base body 11, a light emitting element 21 and a light receiving element 22 are arranged on the reverse surface side of the base body 11, and those are stored integrally in a casing 3. The protection film 4 which has a light cutting layer 45 on its top surface side suppresses the incidence of external light on the sensor film 12 from an inspected medium side and the light receiving element 22 detects only reflected light from the sensor film 12. Thus, the external light from the side of the sensor film 12 is cut off, so the stability of measurement is improved and more accurate data can be obtained. Further, the top surface of the sensor film 12 is protected by the protection film 4, so the sensor film 12 is prevented from damaging and the durability of the sensor is increased.</p> |
