Patent ID: 9074933
Filing Date: 2015-07-07
Classification: G01J

Abstract:
1. A spectroscopic module comprising: a main unit for transmitting therethrough light incident thereon from one side; a first spectroscopic unit, disposed on the other side of the main unit, for dispersing the light incident on the main unit and reflecting the light to the one side of the main unit; a first photodetector, arranged on the one side of the main unit, for detecting a first light having a first order diffraction light and dispersed by the first spectroscopic unit; a reflection unit for reflecting a second light having a second order diffraction light and dispersed by the first spectroscopic unit; a second spectroscopic unit, disposed on the other side of the main unit, for dispersing the second light reflected by the reflection unit and reflecting the second light to the one side of the main unit; and a second photodetector, arranged on the one side of the main unit, for detecting a third light dispersed by the second spectroscopic unit; wherein, on the one side of the main unit, a light entrance portion for letting the light into the main unit and a light-absorbing layer for absorbing the light are disposed between a first light detecting portion of the first photodetector and a second light detecting portion of the second photodetector; and wherein the reflection unit is located closer to the first and second spectroscopic units than are the first and second photodetectors and the light-absorbing layer and opposes the light-absorbing layer.