Patent application number | Description | Published |
20100277040 | THIN FILM DETECTOR FOR PRESENCE DETECTION - A transducer ( | 11-04-2010 |
20110141472 | MONITORING LIGHT COMING FROM DIFFERENT AREAS | 06-16-2011 |
20110163872 | SYSTEM, DEVICE AND METHOD FOR EMERGENCY PRESENCE DETECTION - A detection device and method includes a transducer array ( | 07-07-2011 |
20120074852 | WAKE-UP OF LIGHT SENSOR IN A LIGHTING SYSTEM - A wireless light sensor, being part of a lighting system, has a sensor element generating a light measuring signal, a microcontroller coupled to the sensor element, and a radio communication device coupled to the microcontroller. The microcontroller has an active mode and a sleeping mode. The light sensor further has a wake-up circuit which determines a rate of change of the light measuring signal, when the microcontroller is in the sleeping mode. The wake-up circuit brings the microcontroller from the sleeping mode into the active mode, when the rate of change of the light measuring signal exceeds a predetermined threshold. | 03-29-2012 |
20120299733 | Presence detection system and lighting system comprising such system - A presence detection system ( | 11-29-2012 |
20140035468 | Illumination system with automatic adaptation to daylight level - An illumination system and method is disclosed. In one example, the illumination system comprises a light source, a controller controlling the power output of the light source, and a light sensor wirelessly communicating with the controller. In a normal mode, the controller controls the light source such that the light level remains substantially constant. In a change mode, the controller controls the light source such that the light level is gradually changed with a predetermined change rate so as to decrease a deviation from a target level, The controller switches from the normal mode to the change mode on the basis of input signals received from the light sensor. The light sensor measures a light level, and decides whether or not to communicate a signal to the controller. The light sensor refrains from transmitting a signal when receiving the signal does not cause the controller to change its control behaviour. | 02-06-2014 |
20150014539 | METHOD AND ALGORITHM FOR SELF-LEARNING/AUTO-COMMISSIONING BY MULTIPLE SENSOR ELEMENTS FOR OUTDOOR LIGHTING APPLICATION - The invention relates to a method of controlling a passive infrared (PIR) sensor, said sensor controlling if an electrical device is on or off, wherein said PIR sensor has at least two sensor elements, each having a lens focusing IR onto them, control electronics comprising of at least one processing unit and one memory, wherein the at least two sensors cover adjacent cover areas, wherein information of detected presence from said at least two sensor elements are used to decrease false triggers by using the time period between subsequent presence detections, and identification of each of said at least two PIR sensor elements. The invention further relates to a method of controlling a passive infrared (PIR) sensor, said sensor controlling if an electrical device is on or off, wherein said PIR sensor has two or more sensor elements, each having a lens focusing IR onto them, control electronics comprising of at least one processing unit and one memory, wherein two or more sensors cover different sequentially adjacent cover areas, wherein the sensor elements have a threshold for IR detection above which threshold a positive signal of presence is provided from the sensor element, said method comprising the step of provide a signal (Pan) if all sensor elements provide a positive signal of presence during a time period shorter than a predetermined time period (T3), and if (P | 01-15-2015 |
20150048954 | CONTROL OF LIGHTING DEVICES - A network of active sensors in a control system is considered. The active sensors, which may be fixed-infrastructure sensors, provide presence detection information to a distributed lighting system. The active sensors communicate by transmitting probe signals. The communication of probe signals may result in cross-interference which may vary in time. Cross-interference is detected, and can later be avoided, by determining a difference between signals received in a first part of a timeslot and signals received in a second part of the timeslot. In order to do so probe signals comprising two non-zero pulses are transmitted in respective parts of the timeslot. Applications are, for example, active presence sensors in lighting control applications in indoor as well as outdoor environments. | 02-19-2015 |