Abstract:
PROBLEM TO BE SOLVED: To provide a fourier transform infrared spectrophotometer that includes an optical element using an optical material having deliquescence and can dispense with or reduce desiccant exchanging working. SOLUTION: In this fourier transform infrared spectrophotometer, a drying unit 5 provided with a Peltier element is provided in order to maintain the inside of a hermetically sealed chamber 1 in a dried state. The cooling side 6 and heating side 7 of the Peltier element are respectively disposed on the inside and outside of the hermetically sealed chamber 1. The drying unit 5 is provided with a moisture absorbent 8 so as to carry moisture from the cooling side 6 to the heating side 7. When the Peltier element of the unit 5 is energized, the moisture in the hermetically sealed chamber 1 is condensed into dew in a cooling section which is in contact with the cooling side 6 in the chamber 1 and the dew is carried to the heating side 7 on the outside of the chamber 7 through the absorbent 8 and evaporated to the outside after the dew is heated by the heating side 7. COPYRIGHT: (C)2004,JPO
Abstract:
PURPOSE:To simplify the structure of a device and to adjust easily the device by sampling a signal from an infrared-ray detector by a pulse train signal formed by laser interference light obtained from a Michaelson type interfer ometer, storing the sampled signal in a buffer memory, then transferring the stored signal to a main memory. CONSTITUTION:Respective light rays from an infrared light source 1 and a laser light source 2 are made incident upon a sample cell 6 by the Michaelson type interferometer consisting of a translucent mirror 3, a fixed mirror 4 and a moving mirror 6 having a photosensor 10. The infrared light and laser light are detected by respective detectors 8, 9, a signal outputted from the detector 8 is supplied to a trigger pulse generating circuit 11 and an amplifier 12 and a signal from the detector 9 is supplied to a counter 16 and a gate circuit 17 through a pulse shaping circuit 15. The circuit 17 sends a pulse from the circuit 15 to an A/D converter 13 on the basis of the signal from the detector 9 and stores the signal of the amplifier 12 in a buffer memory 14. When the number of pluses from the circuit 15 reaches a prescribed value, the circuit 17 stops the supply of pulses to the converter 13 and a computer 19 transfers the pre scribed number of data in the memory 14 to the main memory 20.