Abstract

After a discussion of the nature and history of the wavelength drive problem, the construction and operation of an interferometrically controlled hydraulic wavelength drive is described. With servo control, the interferometer end reflector which is maintained in contact with the driven element is advanced linearly to within 0.1 fringe. The speed of the hydraulic drive without servo control suffers from drift amounting to some 3% and arising primarily from temperature change. In its present embodiment the hydraulic drive is being used to rotate the telescope mirror in a 1.5-m Czerny-Turner spectrometer now under construction. The results of over-all tests on the drive indicate that this application will result in a spectral scan which is good to 1/1000 Kayser.

© 1961 Optical Society of America

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