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Described herein is a method of taking timing measurements from an optical emitter where the measurements are insensitive to emitter symmetry and quadrature changes.
English (United States)
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Improved Timing Resolution Emitter Detection
Described herein is a method of taking timing measurements from an optical
emitter where the measurements are insensitive to emitter symmetry and
Referring to Fig. 1, the emitter 10 has two channels consisting of light
sources 12 and 14 and photodetectors 16 and 18, which are positioned to
provide a pair of symmetrical signals occurring in quadrature to one another.
The signals are shown in Fig. 2. Conventional timing methods involve
measuring from t1 to t2, t2 to t3, and so forth, for high density timing
measurement or from t1 to t5, t5 to t9, and so forth, for high accuracy
The measurement resolution can be increased and the accuracy maintained
by multiplexing numerous time measurements, such as T1, T2, T3 and T4 shown
in Fig. 2. These multiple measurements will reduce the errors due to the emitter.
Since T1 is measured from the rising edges A, it is a precise measurement.
Similarly for T2, T3 and T4. The same sampling frequency can be attained by
measuring the time from the edge of A to the edge of B, but emitter errors and
counter resolution may be problems. The multiplexing also increases the
resolution by a factor of four over measuring A or B cycle time (t1 to t5 or t2 to t6,
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