| http://www.w3.org/ns/prov#value | - Stated another way, the length of an optical path can be readily determined as a function of the proper modulation frequency that produces a relatively constant output at detector 108. [0061] Adjustments to modulation signal 128 may be performed by a microcontroller, microprocessor, digital signal processor or other controller associated with electronic system 126. [0062] The detector output is sa
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