Analysis of theoretical model of thermal infrared imager based on the substrate-free focal plane array

Xing-Kai, Jiang; Zhang, Qingchuan; Shi, Haitao; Liang, Mao; Teng, Cheng; Wu, Xiaoping

doi:10.7498/aps.60.054401

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…Similarly, the supporting frame in the heataffected zone is also considered to be an equivalent element with an average temperature rise of ΔT mfrm , and the heat exchanges are equivalent to three parallel resistances: R mfrm,cond , R mfrm,rad , R mfrm,air , and can be expressed as [10]…”

Section: Ir Absorber (T C )mentioning

confidence: 99%

Research of Infrared Imaging at Atmospheric Pressure Using a Substrate-Free Focal Plane Array

Cheng

Zhang

et al. 2013

Chinese Phys. Lett.

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An equivalent circuit model to the substrate-free focal plane array (FPA) is established. Using this fast and effective model, the performance of infrared (IR) imaging at atmospheric pressure is investigated and it is found that the substrate-free FPA has the ability of IR imaging at atmospheric pressure, whereas it has a slightly degraded noise equivalent temperature difference (NETD) as compared with IR imaging under a high vacuum. This feature is also identified experimentally by a substrate-free FPA with pixel size of 50 × 50 μm 2. The NETDs are measured to be 160 mK at 10 −2 Pa pressure and 1.08 K at atmospheric pressure.

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Section: Ir Absorber (T C )mentioning

confidence: 99%

Research of Infrared Imaging at Atmospheric Pressure Using a Substrate-Free Focal Plane Array

Cheng

Zhang

et al. 2013

Chinese Phys. Lett.

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A substrate-free optical readout focal plane array with a heat sink structure

et al. 2013

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A substrate-free optical readout focal plane array (FPA) operating in 8-12 m with a heat sink structure (HSS) was fabricated and its performance was tested. The temperature distribution of the FPA with an HSS investigated by using a commercial FLIR IR camera shows excellent uniformity. The thermal cross-talk effect existing in traditional substrate-free FPAs was eliminated effectively. The heat sink is fabricated successfully by electroplating copper, which provides high thermal capacity and high thermal conductivity, on the frame of substrate-free FPA. The FPA was tested in the optical-readout system, the results show that the response and NETD are 13.6 grey/K (F / # D 0.8)and 588 mK, respectively.

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A temperature and emissivity separation algorithm based on maximum entropy estimation of alpha spectrum's scaling and translation

Jun-Chi¹,

Li²,

Wang³

et al. 2015

Acta Phys. Sin.

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In the thermal infrared (TIR) waveband, solving the target emissivity spectrum and temperature leads to an ill-posed problem in which the number of unknown parameters is larger than that of available measurements. Generally, the approaches developed for solving this kind of problems are called, by a joint name, the TES (temperature and emissivity separation) algorithm. As is shown in the name, the TES algorithm is dedicated to separating the target temperature and emissivity in the calculating procedure. In this paper, a novel method called the new MaxEnt (maximum entropy) TES algorithm is proposed, which is considered as a promotion of the MaxEnt TES algorithm proposed by Barducci. The maximum entropy estimation is utilized as the basic framework in the two preceding algorithms, so that the two algorithms both could make temperature and emissivity separation, independent of experiential information derived by some special data bases. As a result, the two algorithms could be applied to solve the temperature and emissivity spectrum of the targets which are absolutely unknown to us. However, what makes the two algorithms different is that the alpha spectrum derived by the ADE (alpha derived emissivity) method is considered as priori information to be added in the new MaxEnt TES algorithm. Based on the Wien approximation, the ADE method is dedicated to the calculation of the alpha spectrum which has a similar distribution to the true emissivity spectrum. Based on the preceding promotion, the new MaxEnt TES algorithm keeps a simpler mathematical formalism. Without any doubt, the new MaxEnt TES algorithm provides a faster computation for large volumes of data (i.e. hyperspectral images of the Earth). Some numerical simulations have been performed; the data and results show that, the maximum RMSE of emissivity estimation is 0.017, the maximum absolute error of temperature estimation is 0.62 K. Added with Gaussian white noise in which the signal to noise ratio is measured to be 11, the relative RMSE of emissivity estimation is 2.67%, the relative error of temperature estimation is 1.26%. Conclusion shows that the new MaxEnt TES algorithm may achieve high accuracy and fast calculating speed, and also get nice robustness against noise.

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Analysis of theoretical model of thermal infrared imager based on the substrate-free focal plane array

Cited by 3 publications

References 14 publications

Research of Infrared Imaging at Atmospheric Pressure Using a Substrate-Free Focal Plane Array

Research of Infrared Imaging at Atmospheric Pressure Using a Substrate-Free Focal Plane Array

A substrate-free optical readout focal plane array with a heat sink structure

A temperature and emissivity separation algorithm based on maximum entropy estimation of alpha spectrum's scaling and translation

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