Heeley, A. orcid.org/0000-0002-4088-3974, Hobbs, M.J. and Willmott, J. orcid.org/0000-0002-4242-1204 (2020) Zero drift infrared radiation thermometer using chopper stabilised pre-amplifier. Applied Sciences, 10 (14). 4843. ISSN 2076-3417
Abstract
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | infrared thermometer; mid-wave infrared; indium arsenide antimony photodiode; uncooled thermometer; fibreoptic coupling; chopper stabilised op-amp; zero-drift pre-amplifier |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/M009106/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 15 Jul 2020 11:54 |
Last Modified: | 15 Jul 2020 11:55 |
Status: | Published |
Publisher: | MDPI AG |
Refereed: | Yes |
Identification Number: | 10.3390/app10144843 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:163254 |