| 摘要 |
A dispersion-type spectral element (1) designed for reflecting an incident sample light is rotated by a drive mechanism (2). The sample light reflected by the element (1) is applied to a sample-light receiving device (3). The device (3) converts the light into a first signal representing the intensity of the sample light. Reference light consisting of beams having various wavelengths over a broad range is supplied from a reference light source (4) to the spectral element (1). Further, standard light consisting of one beam of a known wavelength is also supplied from a standard light source (7) to the spectral element (1). The reference light reflected by the element (1) is applied to a reference-light receiving device (5). The reference-light receiving device (5) converts the reference light into a second signal representing the intensity of the light. An etalon (6) is located in the optical path between the spectral element (1) and the reference-light receiving device (5). The standard light reflected by the element (1) is applied to the standard-light receiving device (8). The standard-light receiving device (8) converts the standard light into a third signal representing the intensity of the standard light. An arithmetic unit (9) receives the first, second, and third signals separately, and obtains from the second and third signals a wavelength scale used for calculating from the first signal the wavelength of the sample light.
|
