Heterodyne Fourier transform spectrometer for the near-infrared region

被引：12

作者：

Hirai, A

Matsumoto, H

Lin, DJ

Tagaki, C

机构：

[1] Natl Inst Adv Ind Sci & Technol, Lengths & Dimens Div, Natl Metrol Inst Japan, Tsukuba, Ibaraki 3058563, Japan

[2] Tsinghua Univ, State Key Lab Precis Measurment Technol & Inst, Beijing 100084, Peoples R China

[3] Nagano Prefecture, Div Chem, Precis Technol Res Inst, Nagano 3940084, Japan

来源：

OPTICS EXPRESS | 2003年 / 11卷 / 11期

关键词：

D O I：

10.1364/OE.11.001258

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A Fourier transform spectrometer with heterodyne modulation achieved by a moving diffraction grating has been developed for the near-infrared (NIR) region. The grating simultaneously acts as a beam splitter and a modulator, which realizes the optical frequency shift of incident light for increasing the sensitivity of measurements by the heterodyne detection technique. The differences in diffraction angle among broad spectra are compensated by a collimating mirror and plane mirrors. The proposed spectrometer is used for the measurements of spectra in the NIR region. The signal-to-noise ratio of measurements is improved sevenfold with a heterodyne modulation of 410 Hz. As examples, this spectrometer is applied for quantitative calibration and discrimination of organic solutions. The measurement of transmission spectra of a grape is also demonstrated. (C) 2003 Optical Society of America.

引用

页码：1258 / 1264

页数：7

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