| 摘要 |
PCT No. PCT/FI88/00103 Sec. 371 Date Jan. 19, 1990 Sec. 102(e) Date Jan. 19, 1990 PCT Filed Jun. 23, 1988 PCT Pub. No. WO88/10462 PCT Pub. Date Dec. 29, 1988.The present invention concerns a procedure for controlling a radiation source which has been implemented with the aid of light-emitting diodes, or LEDs, from the radiation produced by them being separated the desired wavelength range, of which the intensity is controlled or maintained constant. The radiation source is implemented by means of a LED row (2) formed of semiconductor chips, or LED elements (21, 22, 23, . . . , 26), from the radiation of which is separated a wavelength range ( DELTA lambda 1, DELTA lambda 2, . . . ) depending on the location of the LED element in said arrays with an optical means dispersing the radiation to a spectrum, and the intensity of the radiation in this wavelength range, or of the output radiation, is controlled or maintained constant by observing the intensity thereof and regulating with its aid the current passing through the respective LED element. The wavelength ranges of the output radiation are selected electrically by activating a suitable LED element (21, 22, 23, . . . , 26) in the LED row (2).
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