<i>The Detection and Measurement of Infra-Red Radiation</i>

Smith, R. A.; Jones, F. E.; Chasmar, R. P.; Malamud, Herbert

doi:10.1063/1.3035697

Cited by 36 publications

(18 citation statements)

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“…The microbridge provides good thermal isolation from the substrate, which manifests itself as high responsivity. The small thermal mass of the pixel results in a fast time response 4 .…”

Section: Detector Designmentioning

confidence: 99%

<title>IR detectors for the GERB instrument on MSG</title>

et al. 1997

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The Geostationary Earth Radiation Budget (GERB) instrument is to be flown on ESA"s Meteosat Second Generation (MSG) satellite in 2000. The purpose of the instrument is to measure accurately the daily cycle of the reflected and emitted radiation of the Earth over at least a five year period. The measurements will be made from geostationary orbit and will complement those planned from instruments in low Earth polar orbits. The data from GERB will provide the first consistent measurements of the hour-by-hour variation of clouds and simultaneous measurements of the radiation balance, and will allow climate models to be further developed and validated. The instrument will accumulate images of the Earth disc every 15 minutes in wavebands of 0.32 -4.0 m and 0.32 -30 m with a nadir resolution of 50 km. The detector for this instrument consists of a 256 pixel linear array of thermoelectric (TE) elements. The TE array operates at room temperature and is blacked to give a flat spectral response over the 0.32 -30 m band. The detector hybrid consists of the 256 pixel detector plus 4 Application Specific Integrated Circuits (ASICs), comprising 64 channels each, which perform front end analogue signal processing, A/D conversion and multiplexing. As the MSG platform is spin-stabilised, the Earth image is stabilised on the detector using a de-spin mirror and is only present on the detector for 40 ms. Integration of the signal over the 40 ms and taken over a 15 minute observation period enables the radiance in both long and short wavebands to be measured to an accuracy better than 1%. The detector concept is described and test results of a prototype system are presented.

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“…The microbridge provides good thermal isolation from the substrate, which manifests itself as high responsivity. The small thermal mass of the pixel results in a fast time response 4 .…”

Section: Detector Designmentioning

confidence: 99%

<title>IR detectors for the GERB instrument on MSG</title>

et al. 1997

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“…Now the thermoelectric voltage U TE =(P P +P)γ/A can be expressed in terms of the thermocouple's complex dynamic impedance Z D defined in [4],…”

Section: Power Balance Equation and Bias Currentmentioning

confidence: 99%

“…Conn coined the term thermocouple bolometer to designate a biased radiation thermocouple operated like a bolometer. In the following, the responsivity and detectivity of a thermocouple bolometer (TB) will be calculated based on the theories of the performance of bolometers by Jones [3], Smith et al [4] and Mather [5] and of radiation thermocouples by Smith et al [4] thereby including the Peltier effect. The electrical resistance and thermal conductance of the TB, which are input parameters for these calculations, will be modeled using a simple strip geometry to facilitate one-dimensional analytical electrothermal modeling.…”

Section: Introductionmentioning

confidence: 99%

Responsivity and detectivity modelling of thermal radiation sensors based on a biased thermocouple

Dillner¹,

Kessler²,

Meyer³

2011

J. Phys. D: Appl. Phys.

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Abstract. Thermal radiation sensors are based on two signal transduction stages: radiation to thermal and thermal to electrical. The most common of these sensors are the radiation thermocouple using the Seebeck effect and the bolometer applying the thermoresistive effect. While the bolometer requires a bias current for signal generation the thermocouple is generally operated unbiased. The paper theoretically investigates a biased thermocouple instead, which can be thought of as a combination of both thermal radiation sensor types. Its responsivity and detectivity is calculated based on previous theories of the performance of bolometers and radiation thermocouples, respectively, thereby including the Peltier effect. The electrical resistance and thermal conductance of the thermocouple as input parameters for these calculations are modeled using a simple strip geometry to facilitate one-dimensional analytical electrothermal modeling.

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“…It has to be noted that, even with the best available electronic circuitry, the amplifier noise exceeds the signal generated by the transducer itself [4] resulting in a detection sensitivity far below the theoretical limits determined by the displacement of the microphone diaphragm [5]. Several circuits for microphone and piezoelectric transducer preamplifiers have been described by several investigators [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

High-Gain Low-Noise Pre-Amplifier and Narrow Band-Pass Filter for Photoacoustic Spectrometer

Sapna¹,

Bhaskar²,

Parvathi³

et al. 2014

IJAREEIE

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ABSTRACT:In this paper an attempt is made to design and develop a high-gain low-noise pre-amplifier and a narrow band-pass filter for photoacoustic spectrometer (PAS). A two-stage pre-amplifier with the gain of 1000 and a second order state variable narrow band-pass filter are designed and fabricated. The pre-amplifier and narrow band-pass filter circuits are designed with a low-noise op-amp (LM308). This arrangement improves the sensitivity and signal-to-noise ratio of the photoacoustic (PA) signal. The frequency response of the PA cell is studied with carbon-black and liquid crystal samples. The resonant frequency of the PA cell was found at 345Hz. The performance of the system is tested in both the presence and absence of modulated laser beam applied on the sample, and it is found that the signal quality has been improved with the pre-amplifier and narrow band-pass filter designed for the present study.

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The Detection and Measurement of Infra-Red Radiation

Cited by 36 publications

References 0 publications

<title>IR detectors for the GERB instrument on MSG</title>

<title>IR detectors for the GERB instrument on MSG</title>

Responsivity and detectivity modelling of thermal radiation sensors based on a biased thermocouple

High-Gain Low-Noise Pre-Amplifier and Narrow Band-Pass Filter for Photoacoustic Spectrometer

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