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Fig. 10 | Animal Biotelemetry

Fig. 10

From: An overview of behavioral, physiological, and environmental sensors used in animal biotelemetry and biologging studies

Fig. 10

Explanation of the light gradient sensor. The most basic bearing sensor design is composed of three parts: a light emitter array, a compass wheel with magnet, and a light detector array (a). A transparency gradient on a disk of negative film shown with the boundary between the most transparent and least transparent wedge (b). The resistance of the two photoresistors are plotted over a directional rose of 360°, with the blue arrows indicating the ambiguity zone for sensor #1 and red arrows denoting the ambiguity zone for sensor #2 (c). The sensor is shown without its opaque coating to keep out external light. One must be careful to cover the sensor with multiple coasts of a dark epoxy paint and to measure resistances when the room light are off and on to make sure no external light enters the sensor

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