Foreign body detection by reflected polarised infrared light - esp. for ejection from vegetables processed in food factory
- 专利权人:
- ELBICON ELECTRONICS PVBA
- 发明人:
- 申请号：
- IT19780026890
- 公开号：
- IT1218910(B)
- 申请日:
- 1978.08.21
- 申请国别(地区):
- 意大利
- 年份:
- 1990
- 代理人:
- 摘要：
Foreign bodies travelling along a conveyor together with loose vegetables are detected and ejected by a device using a multi-channel system. This depends upon the reflection of polarised infra-red light and is erected above the conveyor. Each channel consists of a modulated infra-red light source, synchronised with the light sources of the other channels, and an infra-red receiver which detects the reflected light. The signal obtd. is amplified and filtered and is fed to a delayed automatic amplifier control circuit. This attempts to hold the output signal at a definite level, and the output signal is fed to at least one double comparator. There the signal is compared continuously with two independent reference levels which can be adjusted for all channels in common. These comparators deliver an output signal when the output signal of the automatic amplifier control circuit is outside the interval between the two reference levels, and this output signal from the comparators is used to energise an ejector f
- 来源网站：
- 中国工程科技知识中心
