OPTICAL GAS SENSORS

摘要

An optical formula sensor is provided to reduce the size of the whole device and implement the long optical path and the high light efficiency in a narrow side. An optical formula sensor comprises an optical chamber(310), a light source(340), a first optical unit(320), a second optical unit(330), a light receiving element(360), and a filter(350). The chamber comprises a first opening(370) and a second opening(380). The first opening and the second opening are located at the side of an inner cavity. The first optical unit condenses the light generated in the light source to pass through one focus in the center of the optical axis. The second optical unit condenses the light reflected in the inner cavity of the optical chamber. The light receiving element measures the light intensity which is finally incident with the second optical unit. The filter is located between the second optical unit and the light receiving element.