Spectrophotometer with near infrared radiation sensor having an improved sensitivity

摘要

The invention relates to a spectrophotometer having a light source capable of alternatively producing near infrared radiation and another radiation other than the near infrared radiation, a dispersing section for dispersing radiation from the light source to provide substantially monochromatic radiation so that a sample is irradiated with the substantially monochromatic radiation to thereby provide sample radiation, and a sensing section for sensing the sample radiation. The sample radiation is subjected to energy absorption of a specific wavelength by the sample. The sensing section includes a first sensing unit having a near infrared radiation sensor, a second sensing unit having a visible/ultraviolet radiation sensor and a temperature control unit for holding the near infrared radiation sensor at a substantially constant temperature lower than the room temperature.