Voltage Response of a Pyroelectric Detector to a Single Rectangular Optical Radiation Pulse

Odon, A.; Szlachta, A.

doi:10.3390/s22166265

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…The absorption of incident radiation power 𝒫 by the sensing pyroelectric material implies a material temperature variation Δ𝑇 . A thermal power balance in the sensing material allows the expression of ∆𝑇, as follows: These current output responses exhibited similar band-pass type trends as for traditional pyroelectric detectors [30] but with two unconventional slopes: the f +2 slope at very low frequency and the f −1/2 slope at higher frequencies. The cutoff frequency observed at 20 kHz cannot be obviously related to the thermal cutoff frequency, of which the values usually lie in the 0.1 to 10 Hz range for regular pyroelectric detectors [30].…”

Section: Analytical Model and Discussionmentioning

confidence: 85%

“…A thermal power balance in the sensing material allows the expression of ∆𝑇, as follows: These current output responses exhibited similar band-pass type trends as for traditional pyroelectric detectors [30] but with two unconventional slopes: the f +2 slope at very low frequency and the f −1/2 slope at higher frequencies. The cutoff frequency observed at 20 kHz cannot be obviously related to the thermal cutoff frequency, of which the values usually lie in the 0.1 to 10 Hz range for regular pyroelectric detectors [30]. These discrepancies led us to introduce substantial changes to the regular pyroelectric model, as discussed hereafter in Section 4.2.…”

Section: Analytical Model and Discussionmentioning

confidence: 85%

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Fast and Uncooled Semiconducting Ca-Doped Y-Ba-Cu-O Thin Film-Based Thermal Sensors for Infrared

Dégardin,

Alamarguy,

Brézard Oudot

et al. 2023

Sensors

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YBa2Cu3O6+x (YBCO) cuprates are semiconductive when oxygen depleted (x < 0.5). They can be used for uncooled thermal detection in the near-infrared: (i) low temperature deposition on silicon substrates, leading to an amorphous phase (a-YBCO); (ii) pyroelectric properties exploited in thermal detectors offering both low noise and fast response above 1 MHz. However, a-YBCO films exhibit a small direct current (DC) electrical conductivity, with strong non-linearity of current–voltage plots. Calcium doping is well known for improving the transport properties of oxygen-rich YBCO films (x > 0.7). In this paper, we consider the performances of pyroelectric detectors made from calcium-doped (10 at. %) and undoped a-YBCO films. First, the surface microstructure, composition, and DC electrical properties of a-Y0.9Ca0.1Ba2Cu3O6+x films were investigated; then devices were tested at 850 nm wavelength and results were analyzed with an analytical model. A lower DC conductivity was measured for the calcium-doped material, which exhibited a slightly rougher surface, with copper-rich precipitates. The calcium-doped device exhibited a higher specific detectivity (D*=7.5×107 cm·Hz/W at 100 kHz) than the undoped device. Moreover, a shorter thermal time constant (<8 ns) was inferred as compared to the undoped device and commercially available pyroelectric sensors, thus paving the way to significant improvements for fast infrared imaging applications.

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Section: Analytical Model and Discussionmentioning

confidence: 85%

Section: Analytical Model and Discussionmentioning

confidence: 85%

Fast and Uncooled Semiconducting Ca-Doped Y-Ba-Cu-O Thin Film-Based Thermal Sensors for Infrared

Dégardin,

Alamarguy,

Brézard Oudot

et al. 2023

Sensors

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show abstract

“…The thermal dissipation factor

is nonlinearly dependent on the fluid dynamics, and to avoid the influence of the latter, a transparent dome is used. Hence, the thermal dissipation factor can be approximated by a constant [ 22 , 23 ]. The sensor module, composed of a transparent dome, the sensor, and a supporting base, is illustrated in Figure 1 .…”

Section: Methodsmentioning

confidence: 99%

Architecture of an Electrical Equivalence Pyranometer with Temperature Difference Analog Control

Dantas

Segundo

Catunda

et al. 2022

Sensors

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In this paper, an architecture of an electrical equivalence pyranometer with analog control of the temperature difference is presented. The classical electrical equivalence pyranometer employs a Wheatstone bridge with a feedback amplifier to keep the sensor operating at a constant temperature to estimate the incident radiation through the sensor thermal balance employing the electrical equivalence principal. However, this architecture presents limitations under ambient temperature variation, such as sensitivity variation. To overcome those limitations, we propose an architecture that controls the temperature difference between the sensor and ambient via an analog compensating circuit. Analytical results show an improvement near five times in sensitivity over the ambient temperature span and 76.3% increase of useful output voltage. A prototype was developed and validated with a commercial pyranometer, showing a high agreement on the measurement results. It is verified that the use of temperature difference, rather than constant temperature, significantly reduces the effect of ambient temperature variation.

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Voltage Response of a Pyroelectric Detector to a Single Rectangular Optical Radiation Pulse

Cited by 2 publications

References 16 publications

Fast and Uncooled Semiconducting Ca-Doped Y-Ba-Cu-O Thin Film-Based Thermal Sensors for Infrared

Fast and Uncooled Semiconducting Ca-Doped Y-Ba-Cu-O Thin Film-Based Thermal Sensors for Infrared

Architecture of an Electrical Equivalence Pyranometer with Temperature Difference Analog Control

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