| 摘要 |
A circuit (100) is used for producing a constant spectral distribution for stabilising the output of a light standard or reference light source. the circuit includes a discharge tube and is designed to eliminate separate calibration of different sources of the same type. The electric power supplied to the tube is regulated according to the ratio or difference of two wavelengths or comparison values of wavelength regions limited by filters or other devices. A series combination of a spectral filter, photo-receiver, and amplifier is connected to each input of the comparison device whose output is connected to the control amplifier. |
