Reflector-based infrared beams have been around for some time, but are not used as often as transmitter/receiver pairs. One issue with these sensors is if the beam is broken by an object with a highly reflective surface, there is a chance the unit will receive the reflected infrared light and assume the beam has not been broken. Reflector-based devices do have positives: they are quick to install, cost-effective and can eliminate the need for civil works. However, the risk of missed activations is too problematic for many applications.
The PR-30BE from TAKEX changes things, in that it is a reflector-based photoelectric beam which uses Time-of-Flight technology. Time-of-Flight technology accurately measures the time it takes for a signal (in this case an infrared beam) to return to the unit once it has been transmitted. The device ‘learns’ the time taken for the beam to be reflected and returned under normal conditions. If the signal is not returned, or if it is returned in a different timescale, then an alarm is generated.
Time-of-Flight technology is already used in the sensing sector, usually with laser-based devices. These typically cost a significant amount more than photoelectric beams, but the fact the sensing technology is used for high risk applications proves its suitability for security applications.
The PR-30BE has a 30 metre range. It determines the distance of any beam break with a high degree of accuracy as it measures the light reception level and timing, ensuring that genuine alarms are not missed. This eliminates problems with unintended reflections caused by gloss or white surfaces.
Because the sensor does not require power at both ends of the link, installation costs are kept low. If links need to cross waterways, roads or runways, this can be achieved with greater cost-efficiency. The sensor retains the look and size of a typical twin beam device.
Environmental monitoring dynamically optimises performance to match changing conditions, with a dedicated output enabling a pre-alarm warning if required. Other features include response time adjustment, horizontal and vertical adjustment, and a redesigned reflector assembly allowing a minimum operational distance of 0.5 metres.
For simplicity of installation, the PR-30BE makes use of an audible alignment tone function together with a dual-ring viewfinder and monitor output voltage options.
Reflector-based photoelectric sensors offer a number of benefits. With the use of Time-of-Flight technology, the PR-30BE from TAKEX also delivers increased levels of security to ensure there is no compromise in terms of catch performance.
