A Stand-Alone Instrument for Pyroelectric Sensors Arrays With Different Number of Elements and Applications

Capineri, Lorenzo; Casini, Andrea; Lenzi, F; Masotti, L.; Mazzoni, Marina; Bigazzi, Daniele; Ermini, F.; Giovannucci, C.; Russo, Valeria

doi:10.1142/9789812776457_0050

Cited by 2 publications

(3 citation statements)

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“…The motherboard consisted of a versatile acquisition-processing display unit with touch screen, which was designed to be interfaced also to other pyroelectric array of sensors [9]. The motherboard was designed around a Hitachi SH7044 microcontroller with 2 ADCs (analog-to-digital converters) on-chip of 10 bit resolution.…”

Section: A Pyroelectric Analog Current Integration and Digital Signamentioning

confidence: 99%

A Large-Area PVDF Pyroelectric Sensor for CO$_{2}$ Laser Beam Alignment

Mazzoni

Capineri²,

Masotti³

2007

IEEE Sensors J.

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We present the design of a large-area (50 mm 50 mm) polyvynilidene fluoride (PVDF) pyroelectric sensor array for industrial CO 2 ( = 10 6 m) laser beam positioning. The array dimensions were chosen to match the area typically monitored in the alignment procedure of external optics (beam steering moving arm system, for example) used to redirect the laser beam from the laser output window to a remote working station. The instrument is provided with a tilted, high reflection, ZnSe plate which partially transmits the laser beam onto the sensor array. From positioning simulations with a Gaussian laser intensity profile with a = 3 2 mm standard deviation (equivalent spot size 3 = 20 mm), the positional accuracy along the two orthogonal array dimensions was found to be better than 0.02 mm for an 8 8 array and one order of magnitude higher for a 16 16 array. The centroid position of a CO 2 industrial laser beam was evaluated by integrating the pyroelectric current for a time comparable to the time duration (100-200 ms) of the laser pulses used in the alignment procedure.Index Terms-CO 2 industrial laser, electronic instrument, laser beam positioning, PVDF pyroelectric array.

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Section: A Pyroelectric Analog Current Integration and Digital Signamentioning

confidence: 99%

A Large-Area PVDF Pyroelectric Sensor for CO$_{2}$ Laser Beam Alignment

Mazzoni

Capineri²,

Masotti³

2007

IEEE Sensors J.

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“…The reconstructed signal output is available for visualization with an oscilloscope through a 50-output buffer connected to a BNC on the rear panel of the metal case. The four analog signals from the four quadrants of the sensor are buffered to a DB15 connector type for the processing and visualization with an external acquisition board on a PC [4] or a dedicated electronic instrument [8].…”

Section: A Description Of the Measuring Modulementioning

confidence: 99%

“…This fabrication technology based on multilayer thick films allows the design of low-cost pyroelectric sensors with typical bandwidths at 6 dB from 4 Hz to 15 kHz [8] characterized by voltage responsivities with poles and zeros related to material properties [9], [10]. In Section II, we report the characterization of the designed sensor prototype.…”

Section: Introductionmentioning

confidence: 99%

CO/sub 2/ laser pulse monitoring instrument based on PVDF pyroelectric array

et al. 2005

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This paper proposes to extend the use of low-cost, pyroelectric, polyvinylidene fluoride four-quadrant arrays, originally devoted to monitoring the beam point stability of CO 2 laser beams, to the temporal profiling of the same laser pulse providing an instrument that is not commercially available. The advantage of using a single sensor for both types of measurements can be fully exploited if the pyroelectric sensor bandwidth is made almost flat in the typical frequency range (10 Hz-20 kHz) of the signal spectrum generated by a modulated CO 2 laser. In this paper, we present the design of an active analog compensation filter aimed to improve the reconstruction accuracy of the laser pulses and its circuit implementation with a quad operational amplifier for an easy integration of the compensation filter on the same board hosting the sensor. Experimental results obtained with modulated CO 2 laser beams, at pulse repetition rates from 10 to 1000 Hz and variable duty cycle, proved accurate in the laser pulse reconstruction with sensitivity of commercial semiconductor HgCdZnTe sensors.

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A Stand-Alone Instrument for Pyroelectric Sensors Arrays With Different Number of Elements and Applications

Cited by 2 publications

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A Large-Area PVDF Pyroelectric Sensor for CO$_{2}$ Laser Beam Alignment

A Large-Area PVDF Pyroelectric Sensor for CO$_{2}$ Laser Beam Alignment

CO/sub 2/ laser pulse monitoring instrument based on PVDF pyroelectric array

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