Development of a Low-Cost Luminance Imaging Device with Minimal Equipment Calibration Procedures for Absolute and Relative Luminance

Author:

Bishop Daniel1ORCID,Chase J. Geoffrey2ORCID

Affiliation:

1. Department of Civil & Natural Resource Engineering, University of Canterbury, Christchurch 8041, New Zealand

2. Department of Mechanical Engineering, University of Canterbury, Christchurch 8041, New Zealand

Abstract

Luminance maps are information-dense measurements that can be used to directly evaluate and derive a number of important lighting measures, and improve lighting design and practices. However, cost barriers have limited the uptake of luminance imaging devices. This study presents a low-cost custom luminance imaging device developed from a Raspberry Pi microcomputer and camera module; however, the work may be extended to other low-cost imaging devices. Two calibration procedures for absolute and relative luminance are presented, which require minimal equipment. To remove calibration equipment limitations, novel procedures were developed to characterize sensor linearity and vignetting, where the accurate characterization of sensor linearity allows the use of lower-cost and highly non-linear sensors. Overall, the resultant device has an average absolute luminance error of 6.4% and an average relative luminance error of 6.2%. The device has comparable accuracy and performance to other custom devices, which use higher-cost technologies and more expensive calibration equipment, and significantly reduces the cost barrier for luminance imaging and the better lighting it enables.

Funder

Ngau Boon Keat

Publisher

MDPI AG

Subject

Building and Construction,Civil and Structural Engineering,Architecture

Reference55 articles.

1. Bishop, D., and Chase, J.G. (2023). A Luminance-Based Lighting Design Method: A Framework for Lighting Design and Review of Luminance Measures. Sustainability, 15.

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3. Kelly, K., and Durante, A. (2017, January 5–6). A New Interior Lighting Design Methodology-Using MRSE. Proceedings of the CIBSE ASHRAE Technical Symposium, Loughborough, UK.

4. On the Calculation and Measurement of Mean Room Surface Exitance;Duff;Light. Res. Technol.,2016

5. A Method to Assess Lighting Quality in Educational Rooms Using Analytic Hierarchy Process;Leccese;Build Env.,2020

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