Technical solutions are described for testing a light emitting diode (LED) device. An example method includes driving, by a controller, a filter unit to filter a light from the LED device using a first filter. The method further includes, in response to a sensor not receiving a measurable signal because of the first filter, driving, by the controller, the filter unit to filter the light using a second filter. Further, in response to the sensor not receiving the measureable signal because of the second filter, the method includes outputting an indication that the LED device is rejected. Further, in response to the sensor receiving the measureable signal, the method includes outputting an indication that the LED device is of a color representative of the second filter.

Technical solutions are described for testing a light emitting diode (LED) device. An example method includes driving, by a controller, a filter unit to filter a light from the LED device using a first filter. The method further includes, in response to a sensor not receiving a measurable signal because of the first filter, driving, by the controller, the filter unit to filter the light using a second filter. Further, in response to the sensor not receiving the measureable signal because of the second filter, the method includes outputting an indication that the LED device is rejected. Further, in response to the sensor receiving the measureable signal, the method includes outputting an indication that the LED device is of a color representative of the second filter.

To realize collective measurement of ultrawide-band optical signals which have exceeded an electrical band limit. This photodetection device (100) comprises: a time-delay adjustment means (10) into which is input an optical signal that is a detection object; an optical frequency comb generator (20) that generates an optical frequency comb; a photomixer (30) that photomixes optical signal series which are sequentially output from the time delay adjustment means (10) and which were subjected to time adjustment, and the optical frequency comb signal which is output from the optical frequency comb generator (20); and a photodetector (40) that detects the mixed signal output from the photomixer (30). The time delay adjustment means (10) performs time adjustment on the optical signal series so that each of the time adjusted optical signal series is photomixed with the optical frequency comb at different timings in the photomixer (30).

The invention provides a management system for an illumination facility, which comprises an illuminance measuring instrument, a position detector for detecting a position of the traveling vehicle, and an arithmetic device, which are mounted on a traveling vehicle, wherein the arithmetic device is configured to save a map information, positional data of an illumination lamp, initial data including illuminance data, and the illuminance data as acquired by the illuminance measuring instrument while driving the traveling vehicle, and wherein the arithmetic device is configured to calculate daily management data of the illumination facility based on the positional data of the traveling vehicle as detected by the position detector, the map information, and the illuminance data, and further wherein the arithmetic device is configured to calculate a change of the illumination facility including the illumination lamp based on the initial data and the daily management data.

To realize collective measurement of ultrawide-band optical signals which have exceeded an electrical band limit. This photodetection device (100) comprises: a time-delay adjustment means (10) into which is input an optical signal that is a detection object; an optical frequency comb generator (20) that generates an optical frequency comb; a photomixer (30) that photomixes optical signal series which are sequentially output from the time delay adjustment means (10) and which were subjected to time adjustment, and the optical frequency comb signal which is output from the optical frequency comb generator (20); and a photodetector (40) that detects the mixed signal output from the photomixer (30). The time delay adjustment means (10) performs time adjustment on the optical signal series so that each of the time adjusted optical signal series is photomixed with the optical frequency comb at different timings in the photomixer (30).

The invention provides a management system for an illumination facility, which comprises an illuminance measuring instrument, a position detector for detecting a position of the traveling vehicle, and an arithmetic device, which are mounted on a traveling vehicle, wherein the arithmetic device is configured to save a map information, positional data of an illumination lamp, initial data including illuminance data, and the illuminance data as acquired by the illuminance measuring instrument while driving the traveling vehicle, and wherein the arithmetic device is configured to calculate daily management data of the illumination facility based on the positional data of the traveling vehicle as detected by the position detector, the map information, and the illuminance data, and further wherein the arithmetic device is configured to calculate a change of the illumination facility including the illumination lamp based on the initial data and the daily management data.