This article presents the design criteria, the prototype development, and application results of a low-cost four quadrants infrared ~IR! detector. The detector was specifically developed as a position sensor for the alignment of low power IR laser diode beams, especially for spectroscopic applications. The detector consists of a polyvinilidene difluoride pyroelectric radiation sensor of 434 mm2 total surface area and of a four-channel high gain transimpedance amplifier, followed by a narrow bandwidth resonant filter for noise rejection. The overall single pixel responsivity resulted 3590Vroot mean square /W¯ at 5.8 mm, and modulation frequency of 85 Hz. The beam spot centroid of a square-wave modulated laser diode emitting 85mW¯ was determined using an algorithm evaluating the difference signals between diagonal elements along vertical and horizontal scanning directions. An uncertainty in the centroid position of 6 mm, in both directions, was obtained, mainly limited by the digitizing resolution of the 12-bit acquisition system.

A beam position sensor for low power infrared laser diodes / Capineri, Lorenzo; Masotti, Leonardo; Mazzoni, M.; Toci, G.; Mazzinghi, P.. - In: REVIEW OF SCIENTIFIC INSTRUMENTS. - ISSN 0034-6748. - ELETTRONICO. - 70:(1999), pp. 1341-1348. [10.1063/1.1149594]

A beam position sensor for low power infrared laser diodes

CAPINERI, LORENZO;MASOTTI, LEONARDO;
1999

Abstract

This article presents the design criteria, the prototype development, and application results of a low-cost four quadrants infrared ~IR! detector. The detector was specifically developed as a position sensor for the alignment of low power IR laser diode beams, especially for spectroscopic applications. The detector consists of a polyvinilidene difluoride pyroelectric radiation sensor of 434 mm2 total surface area and of a four-channel high gain transimpedance amplifier, followed by a narrow bandwidth resonant filter for noise rejection. The overall single pixel responsivity resulted 3590Vroot mean square /W¯ at 5.8 mm, and modulation frequency of 85 Hz. The beam spot centroid of a square-wave modulated laser diode emitting 85mW¯ was determined using an algorithm evaluating the difference signals between diagonal elements along vertical and horizontal scanning directions. An uncertainty in the centroid position of 6 mm, in both directions, was obtained, mainly limited by the digitizing resolution of the 12-bit acquisition system.
1999
70
1341
1348
Capineri, Lorenzo; Masotti, Leonardo; Mazzoni, M.; Toci, G.; Mazzinghi, P.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/205275
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