公开(公告)号：JPH09101201A

公开(公告)日：1997-04-15

申请号：JP14463096

申请日：1996-06-06

Applicant: SANTA BARBARA RES CENTER

Inventor： JIYON II SUTANNAADO ,  KIYASHII EMU PIITAASON ,  ROJIYAA EE UESUTO ,  JIYOFURII EE WARUTAA

IPC: G01J3/28 ,  G01J3/36 ,  G01J3/457

Abstract: PROBLEM TO BE SOLVED: To provide a differential spectrometer system for detecting the spectral characteristics in a very narrow band with a high light transmission. SOLUTION: The differential spectrometer system comprises a plurality of photodetectors 10a, 10b constituted to detect light of frequency bands [λ1 to λ2 ] and [(λ1 +Δλ) to λ2 ] which are wider than a target narrow frequency band [(λ1 +Δλ) to λ1 ] and to produce an output variable with the light in these wide range, and a processor 18 for processing the outputs from the detectors 10a, 10b. The wide frequency band includes an overlapping part and a nonoverlapping part, i.e., a target narrow frequency band. The processor 18 processes the outputs from the detectors 10a, 10b to produce an output signal 22 including only the nonoverlapping part, i.e., a narrow frequency band (λ1 +Δλ) to λ1 .