Sensor for monitoring medium in optical path between electromagnetic radiation source e.g. luminescent diode and charge coupled device (CCD) sensor, detects spectrum change by alteration of mediums arranged in optical path
Sensor for monitoring medium in optical path between electromagnetic radiation source e.g. luminescent diode and charge coupled device (CCD) sensor, detects spectrum change by alteration of mediums arranged in optical path
Unattended automated system for selling and dispensing station has dispensing, payment acceptance, verification, printing, dispensing activating and control means