{"id":4576,"date":"2022-12-13T19:32:38","date_gmt":"2022-12-13T19:32:38","guid":{"rendered":"https:\/\/acpsa.ch\/?page_id=4576"},"modified":"2025-11-26T16:12:23","modified_gmt":"2025-11-26T16:12:23","slug":"lum","status":"publish","type":"page","link":"https:\/\/acpsa.ch\/en\/lum\/","title":{"rendered":"Luminance sensor"},"content":{"rendered":"
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ACP \/ LUM<\/strong><\/h1>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Luminance sensor<\/h3>

The ACP LUM sensor is a new measurement system based on a CMOS (Complementary Metal-Oxide-Semiconductor) image sensor with fixed focal length lenses and connected to an embedded system.
In the entrance area of a tunnel, the street luminance is expected to correlate with the external luminance; neither too low nor too high, so as not to overlook a possible obstacle in one case and be dazzled in the other.
ACP LUM establishes a connection to the detection and control systems for road tunnels via a 4-20 mA cable and optionally via a Modbus RTU communication protocol. The innovation of the ACP LUM lies in the use of CMOS image sensors in combination with a luminance calculation algorithm, very accurate measurements can be recorded.
The device parameters and commissioning can be set using a wireless connection via a web interface.
In addition, the device can detect various other sensors via the standard output for luminance cd\/m2 4-20 mA (measured value) and the relay contact (fault NC), such as the measurement of wind speed and direction (weather stations), external temperature and humidity measurement sensors, fog meters, etc., always with analog and digital outputs or via RS485 ModBus RTU serial.
The ACP LUM Web Browser APP with wireless connection provides a precise view of the tunnel entrance and thus enables perfect alignment of the luminance camera. Controls and value settings via the Web Browser APP (on mobile or PC) facilitate commissioning and measurement quality.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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