This paper describes an easy method and an instrument developed for a digital measurement of small gap length. The instrument consists of the optical system with a photo-electric transducer and the electronic circuit.
In the measuring system, small gap length is detected as transverse time of light spot on the gap, and the time is measured by counting the corresponding number of pulses from the reference clock oscillator.
It is examined experimentaly that the relations between count error and frequency of the reference clock oscillator, the error due to misalignment of gap elements.
From the result of the experiment, it is said that this non-contact method enables the measurement of small gap length without any fixed datum, and that the measuring range of small gap length by the instrument is from about 01.2 mm, with error of 0.3%.
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