Patent ID: 9074996
Filing Date: 2015-07-07
Classification: G01N

Abstract:
1. A liquid component sensor comprising: an infrared light source; a detection cell, which includes: a pair of substrates made of material for penetrating an infrared light therethrough and stacked each other; a passage for flowing liquid arranged between facing surfaces of the substrates; and a detection portion for detecting the liquid provided by at least a part of the passage; a spectrometer for dispersing light penetrating the detection cell; and a light detector for detecting dispersed light, wherein: each substrate includes an outside surface and the facing surface, which faces another substrate, and the outside surface is opposite to the facing surface, so that the pair of substrates provide four surfaces totally; the detection cell further includes a filter for passing the infrared light having a predetermined wavelength selectively; the filter is disposed on at least one of four surfaces at a predetermined position, which corresponds to at least the detection portion; the filter includes a moth eye structure portion, which has a plurality of protrusions arranged at predetermined pitches; the moth eye structure portion includes an inner portion and an outer portion; the inner portion is disposed at the predetermined position, which corresponds to the detection portion; the outer portion surrounds the inner portion; the inner portion has a plurality of protrusions arranged at predetermined first pitches; and the outer portion has a plurality of protrusions arranged at predetermined second pitches, each of which is larger than the first pitch.