By George A. Vanasse

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Another half cycle is a dead zone, since it produces a feedback signal of the opposite phase. The range which is usable as the servo error signal for positioning is further reduced to a linear portion of the original signal, approximately a quarter of its complete cycle. The second group of schemes generates a signal which can indicate the phase angle on a linear scale. Such a scheme can produce a signal having no dead zone in the servo range, and under control of this signal the interfer­ ometer may be positioned anywhere within the entire fringe cycle.

It can be seen from Eq. 53) that the value of (S/N)in can be very high. When the desired signal-to-noise ratio (S/N)sp is 103 for the measurement of 106 elements, the signal-to-noise ratio (S/N)in in the recorded interferogram must be on the order of 106 at zero path difference. There are two questions to be raised if a scheme is implemented to measure such a high value of the signal-to-noise ratio: (1) Is it possible to measure a quantity having the (S/N) of an order of 106? (2) Is it possible to raise the (S/N) to such a high value in the measure­ ment?

The resulting wavefront deforma­ tion is very slight if the displacement is within several wavelengths. A servocontrolled mechanism having a fast response can be easily implemented 1. HIGH RESOLVING POWER FOURIER SPECTROSCOPY 39 for driving a light secondary mirror. The drive motor is made of a stack of piezoelectric crystals, and the whole secondary mirror can be driven at a rate of several hundred kilohertz. Fast-stepping operation of the inter­ ferometer is impossible without this feature. C.

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