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Fully-digital low-frequency lock-in amplifier for photoluminescence measurements

TitoloFully-digital low-frequency lock-in amplifier for photoluminescence measurements
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2023
AutoriPollastrone, F., Piccinini M., Pizzoferrato R., Palucci A., and Montereali Maria Rita
RivistaAnalog Integrated Circuits and Signal Processing
Parole chiaveCosts, Digital signal processing, Experimental physics, Firmware, Frequency lock, High-precision, Lock-in amplifier, Locks (fasteners), Low-costs, Lower frequencies, Microcontrollers, Noise figure, Operating ranges, Photoluminescence, Photoluminescence measurements, Quadrature demodulation, Radiofrequencies, White noise

Lock-in amplifiers, used in several experimental physics applications, are instruments performing quadrature demodulation, which is useful when signals are affected by much noise. Generally, commercially-available lock-in amplifiers are very accurate, but expensive, especially if their operating range includes radiofrequencies. In many applications, high precision is not necessary for the measurements, but it is preferable to have low-cost, low-weight, compactness and a user-friendly graphical unit interface. In this paper, we describe a new fully-digital low-frequency lock-in amplifier developed at ENEA C.R. Frascati Laboratories for photoluminescence experiments based on an innovative low-cost architecture and processing algorithms. The hardware, firmware and software developed for the whole photoluminescence measurement set-up is presented. The present lock-in was first characterized with synthetic electrical sine wave signals and white noise. A dynamic reserve of 43 dB and a noise figure in the range of 25–44 dB were estimated. These results show compatibility with several measurement applications, such as photoluminescence, and the adequacy of the resolutions with respect to the hardware costs. Finally, preliminary results of photoluminescence measurements are presented. © 2023, The Author(s).


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Citation KeyPollastrone2023