A brief guide to pyroelectric detectors

“…Following from the pyroelectric properties [4] of the crystal the pyroelectric current is proportional to the rate of polarization change with temperature known as the pyroelectric coefficient p, the area A d and the rate of temperature change d∆T d /dt within the crystal [5], as shown in Equation (1.4),…”

Section: Thermal To Electrical Conversionmentioning

confidence: 99%

Pulsed performance of pyroelectric detectors

Efthymiou

Ozanyan

2009

J. Phys.: Conf. Ser.

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Abstract:The studies on the behaviour of a Pyroelectric Detector (PED) under the conditions of pulsed load are presented. Taking into account the details of its geometry and thermal connectivity, 3D models resulting to the temperature field in a LiTaO3 pyroelectric crystal are incorporated in a complete detector. From the timeresolved temperature field, the current resulting from the pyroelectric effect is calculated, followed by the PED output from the I-to-V converter. The models are verified experimentally with a commercial PED in the case of 1:1 duty cycle and a high electrical time constant. Further, the predicted response to a burst of 2ns pulses is given for variants of the front-end electronics, allowing the optimal choice of signal processing method. The novelty is the achieved facility to predict the response to pulsed radiation, down to ns pulse widths and arbitrary duty cycle. This is valuable for the engineering of pulsed-source sensor systems requiring detection at room temperature.

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“…13 The remaining noise sources are intrinsic ones, notably ͑i͒ radiation noise i G , ͑ii͒ dielectric loss noise i D , and ͑iii͒ Johnson noise i R . [14][15][16][17] Radiation noise is proportional to the square root of the thermal conductance G between the ME laminate and the heat sink. Proper design of the ME detection system can significantly reduce it.…”

mentioning

confidence: 99%

“…Here, we used a double-stick foam bar to mount the laminate sensors to reduce the thermal conductance G. As a result, the radiation noise was negligible, compared to that introduced by dielectric loss and Johnson noise. The spectral current density of dielectric loss noise can be estimated as 15,16 …”

mentioning

confidence: 99%

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Noise and scale effects on the signal-to-noise ratio in magnetoelectric laminate sensor/detection units

Xing

Viehland

2007

Applied Physics Letters

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We have investigated the output noise level (Eno) and signal-to-noise ratio (SNR) for various magnetoelectric (ME) laminate composites. Our findings show (i) that Eno is nearly independent of materials couple or operational mode and practically determined by the laminate capacitance C and (ii) that the SNR has a scale effect, where it is limited by the volume (V) of the piezoelectric layer. Relations between SNR, V, and the magnetoelectric coefficient (αME) give insights into how to construct ME sensors with enhanced sensitivity to small magnetic variation.

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A brief guide to pyroelectric detectors

Cited by 201 publications

References 38 publications

Harmonic errors associated with the use of choppers in optical experiments

Harmonic errors associated with the use of choppers in optical experiments

Pulsed performance of pyroelectric detectors

Noise and scale effects on the signal-to-noise ratio in magnetoelectric laminate sensor/detection units

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