Patent ID: 6403949
Filing Date: 2002-06-11
Classification: G01J

Abstract:
An apparatus for compensating for systematic error in wavelength measurements provided by a wavelength measuring device used for measuring the wavelengths of peaks in a spectrum of light including light from a reference wavelength selector, the apparatus comprising:a) a temperature sensing and measuring circuit (11), responsive to a temperature to which the reference wavelength selector is exposed, for measuring the temperature, for providing a signal indicative of the temperature; and b) a dynamic compensator (12), responsive to the wavelength measurement signals from the wavelength measuring device, responsive to the signal indicative of the temperature of the reference wavelength selector, and further responsive to a signal indicating a correlation of the true wavelength of light reflected from the reference wavelength selector and the temperature of the reference wavelength selector, for providing dynamic compensator signals indicating information about compensated wavelength measurements, the information about compensated wavelength measurements based on the difference between the true wavelength of light reflected from the reference wavelength selector for the measured temperature of the reference wavelength selector, and the measured wavelength of light reflected from the reference wavelength selector.