| 摘要 |
<p>PURPOSE:To improve the accuracy of measurement by using two sets of light sources which are different in wavelength, calculating the coefft. of compensation of a wavelength fluctuation in accordance with the measured values corresponding respectively to both wavelengths and the constant including both wavelengths. CONSTITUTION:An arithmetic circuit 20 is added to a measuring instrument consisting of the light sources 2a, 2b, a voltage sensor head 5 to which the light signal emitted by the light sources 2a, 2b, are conducted and which modulates the intensity of the light signals according to the voltage to be measured by using an electrooptic element, photodetectors 12a, 12b which detect the light of the head 5 and a circuit which outputs the measured value by processing the electric signals outputted by the photodetectors 12a, 12b. The light sources 2a, 2b emit two beams of the light having the different wavelengths. The circuit which outputs the measured value calculates the measured values corresponding respectively the two wavelengths. The circuit 20 calculates the coefft. of compensation of the spectral fluctuation in accordance with both measured values and the constant including the wavelength of the light sources and outputs the measured value subjected to the compensation of the spectral fluctuation. The measured value is thus substantially unaffected by the wavelength fluctuation and the high accuracy is obtd.</p> |
