| 摘要 |
<p>A method of calibrating a polarimeter to work at a wavelength of unknown frequency comprising calibrating the polarimeter at a standard wavelength, using the calibrated polarimeter to measure a sample, measuring the same sample at the wavelength of unknown frequency and setting the polarimeter to give the same measurement at the said unknown wavelength as at the known wavelength. The method is particularly applicable to be calibration of a saccharimeter to work at a wavelength of unknown frequency in the near infra-red for the measurement of dark sugar samples. The invention is also a polarimeter or saccharimeter for carrying out the method. <IMAGE></p> |
