VOLATILE ORGANIC SUBSTANCE LEAK DETECTOR HAVING WATER-PROOF MECHANISM

摘要

A volatile organic substance leak detector free from any influence of water and so on, and a leak monitoring system using the detector are provided. The volatile organic substance leak detector has a light source unit, and a sensor unit comprising a sensor element having a polymer thin film which exhibits a change in at least one of a thickness and a refractive index in response to a contact with a vaporized organic substance. Light from the light source unit is incident on the polymer thin film, and reflected light therefrom exits from a light transmitting/outputting unit. The sensor unit has a vapor inlet port in which a mechanism is provided for preventing water from immersing into the interior of the sensor unit.