| OCR Text |
Show correlated. The variation in frequency for a rei assembly is determined by recording the count differe the end of each scan and finding deviations from the A deviation from the norm is determined for each slit variation in frequency for slits simultaneously B through an associated light source sensing determined by recording the count differences between all of which see the sarne light source, and deviations from the norm. A deviation from the again determined for each slit. correlated. Correction factors The two deviatio for each slit P. through each light source sensing assembly are dete and subsequently applied. In order to make correction is necessary to know which slit is scanning the enviro This may be done by determining which slit is through the reference assembly. The slit which is through the reference assembly is determined by moni the frequency with which reference pulses arrive unt: sequence is recognized. At most, sixteen reference are needed to recognize the sequence. On the average, pulses are needed. When all sequences of slits recognized, corrections are' made to measurements made light source sensing assemblies during the recognized part of the sequence, measurements made ( the recognized sequence, and subsequent measurE totalling as many as sixty-three. Variations in motor |
