| CPC G01V 8/20 (2013.01) | 11 Claims |

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1. A method of detecting pests, the method comprising:
emitting infrared light from at least one emitter driven by a pulse-width modulated signal;
generating an analog signal based on the infrared light by using at least one detector driven by the pulse-width modulated signal; and
wherein the analog signal indicates a pest is present.
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