METHOD FOR CALIBRATING WAVELENGTH OF SPECTROPHOTOMETER

摘要

PROBLEM TO BE SOLVED: To realize a high wavelength trueness with use of an inexpensive mechanism part. ;SOLUTION: In the method for calibrating a wavelength, the periodicity of angle trueness errors of a rotary driving mechanism is measured beforehand (S1). Single or a plurality of light sources for radiating a bright-line spectrum group of a smaller wavelength distance than a wavelength distance corresponding to a half angle distance of a minimum cycle are prepared (S2, S3). A wavelength in the vicinity of the bright-line spectrum is scanned with use of the light sources and a conversion table of theoretically calculated wavelengths and the number of driving pulses of a stepping motor (S4, S5). The number of actual pulses when a subject bright line is obtained is obtained corresponding to a wavelength of the bright line and stored in an internal RAM (S6). When a necessary measurement is completed for all bright lines, a calibration formula for calibrating the number of pulses is calculated on the basis of the data and stored (S8, S9). In an actual spectrometry, the number of pulses to a desired wavelength is obtained with use of the conversion table and calibration formula.;COPYRIGHT: (C)2000,JPO