Study of the Effective Thermal Emittance of Cylindrical Cavities*

Vollmer, J.

doi:10.1364/josa.47.000926

Cited by 16 publications

(3 citation statements)

References 7 publications

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“…The fibreoptic had a numerical aperture of 0.20, transmitting radiation between 0.2 µm and 4.5 µm in wavelength. The depth to diameter ratio of the calibration thermowell and the exposed tip of the fibre exceeded 5:1, which afforded high relative emissivity approaching blackbody conditions [27,28].…”

Section: Characterisation Of Irts Over Low-temperature Rangesmentioning

confidence: 98%

Zero Drift Infrared Radiation Thermometer Using Chopper Stabilised Pre-Amplifier

2020

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A zero-drift, mid–wave infrared (MWIR) thermometer constructed using a chopper stabilised operational amplifier (op-amp) was compared against an identical thermometer that utilised a precision op-amp. The chopper stabilised op-amp resulted in a zero-drift infrared radiation thermometer (IRT) with approximately 75% lower offset voltage, 50% lower voltage noise and less susceptibility to perturbation by external sources. This was in comparison to the precision op-amp IRT when blanked by a cover at ambient temperature. Significantly, the zero-drift IRT demonstrated improved linearity for the measurement of target temperatures between 20 °C and 70 °C compared to the precision IRT. This eases the IRT calibration procedure, leading to improvement in the tolerance of the temperature measurement of such low target temperatures. The zero-drift IRT was demonstrated to measure a target temperature of 40 °C with a reduction in the root mean square (RMS) noise from 5 K to 1 K compared to the precision IRT.

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Section: Characterisation Of Irts Over Low-temperature Rangesmentioning

confidence: 98%

Zero Drift Infrared Radiation Thermometer Using Chopper Stabilised Pre-Amplifier

2020

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“…(1- 10) Designating the integrals in the numerator and. denominator of eq (1-10) as Bi and B2, respectively, and taking the natural logarithm of both sides of eq (1-10) leads to 1^In^i-ln B2…”

Section: Ifmentioning

confidence: 99%

Theory and methods of optical pyrometry

Kostkowski¹,

Lee²

1962

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b. Absorbing glasses, pyrometer lamp, and red filter 9 c. Microscope assembly d. The electrical circuit 3. Sources 3.1. Blackbodies a. Gold-point blackbodies b. Lesser quality blackbodies 3.2. Tungsten strip lamps a. Types of strip lamps b. Factors affecting the reproducibility of strip lamps 3.3. Other sources a. The carbon arc b. High-pressure arcs 4. Primary caUbration 4.1. Calibration at the gold point 4.2. Calibration above the gold point 4.3. Estimated accuracy 5. Secondary calibrations 19 5.1. Optical pyrometers a. Inspection and cleaning 19 b. Determination of the effective wavelengths 19 c. Calibration procedure d. Low-range calibration e. High-range calibrations 5.2. Tungsten strip lamps a. Calibration range b. Mounting and orientation c. The electrical system d. Calibration 5.3. Precision and accuracy 23 a. Definition of precision and accuracy 23 b. Statistical model for calibration errors 24 c. Uncertainties on certificates 24 d. Differences between the IPTS and TTS 25 6. Applications 25 6.1. Temperature measurements 25 6.2. Spectrical radiance calibrations using strip lamps 25 6.3. Secondary standards 26 6.4. Recommendations for achieving high accuracy and precision 26 6.5. Fundamental limitations 27 6.6. Photoelectric optical pyrometers 27 7. References

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“…The ‘blind’ hole into which the fiber optic would be inserted would have a length to diameter ratio exceeding 5, and the fiber optic core would be exposed along the embedded length, thereby providing a means of collecting radiation from the full surface area of the hole. The depth to bore ratio of this blind hole and the exposed fiber optic would obviate the problem of having to compensate the measured signal for the effect of the relative emissivity of the radiating object because the conditions approximate a blackbody, achieving very high relative emissivity approaching unity [ 27 , 28 ].…”

Section: Introductionmentioning

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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Study of the Effective Thermal Emittance of Cylindrical Cavities*

Cited by 16 publications

References 7 publications

Zero Drift Infrared Radiation Thermometer Using Chopper Stabilised Pre-Amplifier

Zero Drift Infrared Radiation Thermometer Using Chopper Stabilised Pre-Amplifier

Theory and methods of optical pyrometry

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

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