JPS57153226A - Spectrophotometer - Google Patents

Abstract

PURPOSE:To make unnecessary a troublesome controlling operation of a position of parts for setting wavelength, by introducing light from another light source into an incidence slit of a spectroscope at the initial set time of wavelength and using a bright line as a wavelength reference. CONSTITUTION:A triangle mirror 31 is inserted into an optical path by a command of a control circuit 50 and hereby, light emitted from a tungsten lamp 28 through a condensing mirror 29 is intercepted and in place of it, light from a mercury lamp 33 is emitted to an incidence slit 36 of a spectroscope 35. At this time, the spectroscope 35 begins preliminary scanning and as a result, the light of object bright line is emitted through an incidence slit 39. Then, said light passes through a sample room 40 and is received by a detector 41. A dispersion element driving apparatus 90 is received a driving command from the circuit 50 while the mirror 31 is inserted into the optical path and a rotary grating 27 is rotated by the apparatus 90 so that the bright line light having a specific wavelength is made into an angle reaching the detector 41 and is stopped.