METHOD OF DETERMINATION OF REAL VALUE OF LENGTH OF LASER RADIATION WAVE Russian patent published in 1997 - IPC

FIELD: instrumentation, determination of real length of laser radiation wave during interference measurements under given conditions of environment defined by values of temperature, pressure, moisture content. SUBSTANCE: method of determination of real value of length of laser radiation wave in interference device using acoustooptical conversion of light frequency is based on comparison of measured length of light wave with length of ultrasonic wave propagation in acoustooptical modulator which is employed in given method as metrological constant. Standard linear translation is set as result of translation of integral and fractional number of waves of ultrasonic wave in extended acoustic-optical modulator multiplied by value of length of ultrasonic wave. Structure of interference device operating on proposed method should provide for presence of electrical signals separately carrying cophasal information on translation of mobile reflector of interferometer and on translation of acoustooptical modulator. EFFECT: enhanced operational efficiency and reliability. 1 dwg