Spectral Sensitivity Corrections for Optical Standard Pyrometers

Bezemer, Jeff

doi:10.1088/0026-1394/10/2/002

Cited by 25 publications

(11 citation statements)

References 4 publications

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“…The mean effective wavelength represents the average wavelength where the photodiode spectrum intercepts the blackbody spectrum and is weighted across the measured temperature range [17]. This is therefore a simple method of turning temperature signal, which consists of a broad range of wavelengths, into an effective monochromatic wavelength, hence simplifying the calculations [18][19][20]. It can a calculated by plotting the natural logarithm of the output voltage against the inverse of the temperature.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of phase sensitive detection method and Si avalanche photodiode for radiation thermometry

2013

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We report the evaluation of Si avalanche photodiodes (APDs) for use in radiation thermometry as an alternative to Si photodiodes. We compared their performance when operated under phase sensitive detection (PSD), where the signal is modulated, and direct detection (DD) methods. A Si APD was compared with a Si photodiode with reference black body temperatures of 275 to 600 • C, in terms of the mean output voltage and signal-to-noise ratio (SNR), measured at different APD gain values. We found that using both PSD and DD methods, the high internal gain of the Si APD achieved a lower minimum detection temperature in order to satisfy a specific minimum output voltage of the detector-preamplifier combination employed. The use of PSD over DD for the Si APD allowed for improved performance of the thermometer, with a lower minimum measurable temperature, as well as improvement in the SNR. For instance we found that at 350 • C, the Si APD biased at 150 V using PSD can provide ∼ 88 times enhancement in the system SNR over that of a Si photodiode using DD. A corresponding temperature error of ±0.05 • C was achieved using the APD with PSD compared to an error of ±2.75 • C measured using the Si photodiode with DD.

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Section: Resultsmentioning

confidence: 99%

Evaluation of phase sensitive detection method and Si avalanche photodiode for radiation thermometry

2013

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“…The SNR was defined as the ratio of the sample mean and the sample standard deviation of the signal during each measurement. The noise limited resolution was defined as the Celsius temperature equivalent to the sample standard deviation of the signal, approximated at the mean effective wavelength [ 40 , 42 , 43 ]. Example raw data is shown in Figure 7 .…”

Section: Resultsmentioning

confidence: 99%

Miniature Uncooled and Unchopped Fiber Optic Infrared Thermometer for Application to Cutting Tool Temperature Measurement

Heeley

Hobbs

Laalej

et al. 2018

Sensors

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A new infrared thermometer, sensitive to wavelengths between 3 μm and 3.5 μm, has been developed. It is based on an Indium Arsenide Antimony (InAsSb) photodiode, a transimpedance amplifier, and a sapphire fiber optic cable. The thermometer used an uncooled photodiode sensor and received infrared radiation that did not undergo any form of optical chopping, thereby, minimizing the physical size of the device and affording its attachment to a milling machine tool holder. The thermometer is intended for applications requiring that the electronics are located remotely from high-temperature conditions incurred during machining but also affording the potential for use in other harsh conditions. Other example applications include: processes involving chemical reactions and abrasion or fluids that would otherwise present problems for invasive contact sensors to achieve reliable and accurate measurements. The prototype thermometer was capable of measuring temperatures between 200 °C and 1000 °C with sapphire fiber optic cable coupling to high temperature conditions. Future versions of the device will afford temperature measurements on a milling machine cutting tool and could substitute for the standard method of embedding thermocouple wires into the cutting tool inserts. Similarly, other objects within harsh conditions could be measured using these techniques and accelerate developments of the thermometer to suit particular applications.

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“…The relationship between the output voltage of a radiation thermometer, V, and the target temperature can be plotted as ln(V) against 1/T [20]. The extended effective wavelength, λ x , can be approximated by taking the gradient of this plot and can be used to characterise the operating wavelength of the thermometer [21,22]. This plot also enables an assessment of the linearity of the radiation thermometer as a function of target temperature.…”

Section: Theory and Experimental Methodsmentioning

confidence: 99%

InGaAs avalanche photodiode thermometry

Hobbs

Willmott

2019

Meas. Sci. Technol.

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The infrared detector is the most important component within any radiation thermometrybased system, with its choice determining the wavelength, response time and, ultimately, the temperature measurement capabilities of the instrument. To improve upon the existing generation of radiation thermometers, more sensitive detector technologies are required. In this work, we demonstrate a direct comparison between an indium gallium arsenide (InGaAs) photodiode and an InGaAs avalanche photodiode (APD) for 1.6 µm radiation thermometry. The high internal gain of the InGaAs APD increases the sensitivity of the radiation thermometer, enabling the measurement of a target temperature more than 50 °C lower than is typical with commercially available InGaAs photodiode thermometers. The more sensitive InGaAs APD provides faster response time measurements, hence improving the thermometer's temporal resolution. Finally, the InGaAs APD is shown to produce a quantitative thermal image with lower measured temperature fluctuation across the scene when incorporated within a highly aperture limited scanning system.

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Spectral Sensitivity Corrections for Optical Standard Pyrometers

Abstract: A new method is proposed to deal with the spectral width of optical pyrometers. A constant reference wavelength and a radiance correction factor are introduced instead of a temperature dependent effective wavelength as is used in the conventional method.

Cited by 25 publications

References 4 publications

Evaluation of phase sensitive detection method and Si avalanche photodiode for radiation thermometry

Evaluation of phase sensitive detection method and Si avalanche photodiode for radiation thermometry

Miniature Uncooled and Unchopped Fiber Optic Infrared Thermometer for Application to Cutting Tool Temperature Measurement

InGaAs avalanche photodiode thermometry

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