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angles of incidence binary pattern CALL MOVETO capacitance level sensor centimeter channel Chapter Circuit diagram cladding computer model connector contrast ratio coupled waveguides coupling efficiency coupling length coupling peak coupling signal critical angle decoding detector digital level sensor digital sensor electronics encoding liquid level fiber optic liquid fiber optic sensors function of liquid Gray code index of refraction INPUT level of coupling liquid characteristics liquid level information liquid level sensor liquid surface liquid tank liquid-coupled waveguides mask opening micron Microsoft BASIC millimeter openings modulate the coupling nanowatts numerical aperture optic liquid level optical coupling optical fibers optical power coupled optical radar optical waveguides OTDR PRINT#2 prototype digital prototype sensor ray optics receiving fibers receiving guide receiving waveguide reference level reflecting array resolution sensor head shown in Figure signal fibers single reflector slab waveguide Snell's law source guide source waveguide thesis total internal reflection voltage waveguide coupling wavelength