| 摘要 |
<p>PURPOSE:To provide a standard light source by which the light emitting wave length distribution of the light source is not changed as well as to provide a standard light source by which there is no need to transmit an output signal of a light detector to a ground station. CONSTITUTION:A filament temperature of a light source 1 is detected by conduction of sealing gas or radiation in a vacuum by a sensor 9. Electric power supply is controlled so that the temperature becomes constant, and the light emitting wave length distribution of the light source is made constant.</p> |
