| 摘要 |
<p>PROBLEM TO BE SOLVED: To extend the life of a light source and reduce the flicker noise by supplying an alternating current having a specified frequency or more to a metal heating element, and heating a ceramic light emitting body to emit a light. SOLUTION: An infrared ray having a prescribed wavelength is extracted from the infrared ray from an infrared light source device 52 by a spectroscope 54 to emit a sample chamber 56. The sample chamber 56 collects the transmitted light, and a desired data processing is performed by a data processing device 60 from the detected 58 infrared information. The infrared light source means 62 of the light source device 52 has a metal layer heating element heated by current-carrying and a ceramic light emitting body which coversits circumference and emits an infrared ray by heating. A control means 66 controls the output voltage of an ac driving means 64 on the basis of the luminance information of a luminance measuring part 68 so as to constantly keep the luminance of the infrared ray generated from the light source means 62. The driving means 64 converts the supplied power from a commercial power-source 70 of 50-60Hz to 80Hz or more and supplies the resulting power to the light source means 62. Thus, flicker noise is reduced, and a long life of 500 hours or more can be ensured.</p> |
