Abstract:
The adjustable beam splitter for monochromatic light sources is designed to vary the wavelength in conjunction with a linear scale over the entire working range of wavelengths. Light from the source passes through an aperture (S1) to a plane mirror (M1) and concave mirror (M2) to the splitter prism (10). The prism is mounted on a rotating platform moved by a lever (13) to which are attached cam followers (14, 15). The innermost follower runs over the profile of a large cam to cover the 400 to 3000 nm wavelength range. The cam has a notch which allows the second follower wheel to come into operation in conjunction with a second, smaller cam (18) covering the 180 to 400 nm range. Both cams carry toothed wheels (20, 21) which are in constant mesh with each other.
Abstract:
PURPOSE:To prevent the diffusion of intended component gas and to improve the sensitivity of measurement, by providing means for opening and closing flow passages between concentrating traps and a heating gas cell for measuring IR absorption spectra and using the heating gas cell as a closed circuit in the stage of measurement. CONSTITUTION:Concentrating traps 10-12 and front and rear selector cocks 13, 14 are provided to an attachment 1 for a gas chromatograph-IR spectrophotometer in a measuring passage A. A terminal 15 for closing a fluid passage is further provided to the cock 14. A selector valve D changes over and connects a measuring passage A, an introducing passage B for separating components and a gaseous carrier, and a gas discharging path C. The intended component is concd. and captured in the trap 10 by changing over the valve D and the cocks 13, 14. The other intended gaseous components are also captured in the traps 11, 12 by the successive changing over of the cocks 13, 14. The valve D is then changed-over to select the trap 10 first which is heated and the component is transferred by diffusion into a heating gas cell 3, whereby the IR absorption spectrum of the intended gaseous component is measured. The other components are measured in the same way, whereby the diffusion is prevented and the measurement with high sensitivity is made possible.
Abstract:
PURPOSE:To measure an emissivity of a sample near a normal temperature simply and accurately by enabling measuring of light from a sample with the turning of a changeover mirror to keep the sample at a specified temperature with a sample heating furnace. CONSTITUTION:A changeover mirror 5A is turned so that light from a sample S can be measured and then, a measurement is started. At this point, the sample S is kept at a specified temperature with a sample heating furnace 2. Then, a shielding wall 3 is heated with a temperature control system 4 to measure the current power spectrum with an FTIR measuring system 6 and a measuring data is stored into a data processing system 7. Then, the shielding wall 3 is heated with the temperature control system 4 to measure the current power spectrum with the measuring system 6 and a data processing system 7 in which a measuring data thereof is stored computes the power spectrum of the sample S from a measured value stored. Moreover, a heat emissivity of the sample near a normal temperature is determined.
Abstract:
PURPOSE:To obtain the true radiation power spectrum of a sample by calculating an instrument function and correcting the radiation power spectrum of the sample by the instrument function. CONSTITUTION:The measurement data of a black body furnace is stored in a file memory 2 for measurement data of the black body furnace in the signal processing part of an IR spectrophotometer of a radiation measuring instrument and the measurement data of the sample is stored in a file memory 4 for the measurement data. The theoretical value data of the black body radiation at a reference temp. is stored in a file memory 6 for the theoretical value data. A division means 8 determines the instrument function from the ratio between the theoretical value data at the corresponding wavelength and the measurement data of the black body furnace. This instrument function is stored in a file memory 10 for the instrument function. The measurement data stored in the file memory 4 for the measurement data is multiplied by the instrument function of the wavelength corresponding to the file memory 10 for the instrument function in a multiplication means 12 by which the true radiation power spectrum is calculated.
Abstract:
PURPOSE:To prevent the displacement of diffraction gratings at the changing of wavelength scanning by deviating the center of rotation for changing by the distance near 1/2 the distance between two sheets of diffraction gratings from the center of rotation for wavelength scanning in a rotary type changer of two diffraction gratings.
Abstract:
PURPOSE:To adjust the attitude of a fixed mirror or moving mirror in each cycle of the reciprocation of the moving mirror by calculating a correcting signal from errors in a phase difference based upon the specific position of the moving mirror and a phase difference in the best interference state and sending the signal to an adjusting mechanism. CONSTITUTION:When the moving mirror 20 moves forth, measurement data is inputted from a main photodetector 24 and when the mirror 20 moves back, the measurement data is not inputted. A magnetic proximity sensor 50 outputs a detection signal in the forward movement and backward movement of the moving mirror 20 respectively, so when a CPU 56 inputs the signal from the magnetic proximity sensor 20, the phase difference signal is inputted through an A/D converter 2 for a constant time. The correcting signal is calculated according to the phase difference signal and sent out to piezoelectric elements 34 and 36 in the period of the forward movement of the moving mirror, thereby adjusting the fixed mirror 18.
Abstract:
PURPOSE:To protec a beam splitter, by providing a cover, which surrounds the beam splitter in an airtight manner in an interference spectroscope in an infrared region. CONSTITUTION:A beam splitter (BS) 1 in an interference spectroscope in an infrared region is attached to a supporting tool 2. A cover 4 is provided so as to surround the BS1. The cover 4 can be moved up and down through a guiding hole 10 of an upper covering plate 8 and a guiding rod 9. A spring 12 compresses the cover 4 to an elastic member 6 of a receiving table 7. A drying chamber 13 is provided on holes 17 provided in the ceiling of the cover 4. A solid drying agent is enclosed in the chamber 13. When the spectroscope is used, the inside of the spectroscope is filled with a dry gas. Then, the entire cover is moved up through a driving device, a pinion, and a rack. Thus the BS1 is protected.