| 摘要 |
<p>A sensor (1) suitable for the detection and discrimination of objects including: (i) a body (3) having an aperture (11) orientated in use to allow objects to pass therethrough; (ii) at least one light emitter (5) for projecting a band or beam of light (9) across the aperture; (iii) at least one light receiver (15) for detecting the amount of light passing across the aperture; wherein, in use, the profile of an object passing through the aperture is determined ratiometrically by measuring the instantaneous change in the light level caused by the occlusion of light by the passing object. The sensor is applicable to the detection and discrimination of feed pellets, with particular application to aquaculture.</p> |
