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Applications of light emitting diodes as sensors of their own emitted light

Vannacci E., Granchi Simona, Calzolai M., Biagi E.

Opto-Electronics Review

2019

Vol. 27, No. 4

355--362

In literature, it is known that a Light Emitting Diode (LED) could be used as a light sensor. It is also known that its emitted light spectrum and sensitivity spectrum can be partially overlapped. This work presents how commercial LEDs can be used as light emitters and simultaneously as sensors of the reflected portion of the light emitted by themselves. The realized devices present a unique characteristic: the transmitter and the receiver coincide spatially as they are the same device. This ensures the perfect overlapping between transmission and reception radiation lobes that could provide many benefits in several applications like as distance measurements or image sensors. Some simple electronic configurations that use LEDs as detectors of their own emitted light are presented. It has been also demonstrated how these LEDsTx-Rx can work as image sensors by acquiring an image of a simple test object, and how they can realize distance sensors with respect to other known techniques. Further advantages can be obtained by realizing LEDTx-Rx array in single integrated devices. With the realization of such devices, it will be also possible to experiment new constructive solutions for commonly used applications, without the need of using separate emitter and receiver.

Pomiary i sterowanie w dydaktycznym modelu lewitacji magnetycznej

Bączyk R., Lewandowski D., Pluciński P.

Pomiary Automatyka Robotyka

2012

R. 16, nr 2

456-462

Przedmiotem referatu jest konstrukcja oraz analiza systemu magnetycznej lewitacji. Na całość pracy składa się wykonane urządzenie umożliwiające stabilizację unoszonego przedmiotu oraz model symulacyjny. Zaprojektowane i wykonane urządzenie zapewnia sterowanie prądem elektromagnesu w wewnętrznej pętli regulacji oraz położeniem unoszonego przedmiotu - w pętli zewnętrznej. Ponadto sterownik komunikuje się z aplikacją uruchamianą na komputerze PC, która nadzoruje pracę sterownika. Na urządzeniu zamontowano i przebadano trzy różne sensory położenia lewitującego obiektu.

The subject of this paper is the design and analysis of magnetic levitation system. The whole work consists of the simulation model and constructed device enabling stabilization of the levitating object. Designed and built device provides a current control of the electromagnet in the inner loop and the position control of the object lifted - in the outer control loop. In addition, the controller communicates with the application that runs on a PC, which supervise the work of the driver. On the device are mounted and tested three different position sensors.