| 摘要 |
PURPOSE:To reduce measuring errors caused by changes in the sensitivity of elements due to variations in the quantity of light and the ambient temperature, by correcting the measured value according to variation in the intensity of light of a light source at a specified wavelength detected with a light detecting element through an optical fiber and a wavelength separation element. CONSTITUTION:An object 12 to be measured is irradiated with a light source 10, the reflected light is spectrally analyzed with a reflection type diffraction grating 36 through a focusing lens 30, a slit 32 and a collimator lens 34 and then, intensities of reflected lights with various wavelengths are received simultaneously with an array type light detecting element 40 via a concave mirror 38. The signals detected by the element 4 are colorimetrically computed with a digital processor 46 via an amplifier 42 and an A/D converter 44 and a colorimetric value is outputted with an output unit 48. Moreover, a part of light from the light source 10 is introduced to an array type light detecting element train 40, for example, with three optical fibers 50, which are each combined with a wavelength separation element 52 with the determined transmission wavelength. Thus, the calibrating work with a standard white plate can be eliminated by monitoring the intensity of the light source at the specified wavelength. |
