The National Physical Laboratory of India situated in Delhi is the measurement standards laboratory of India. National Physical Laboratory (NPL), Delhiįig.2 Luminance Measurement setup at NPL, Delhi. However, these setups are not feasible to be used at a smaller scale due to large size, difficulty in handling and higher costing. Many apex organizations have developed their own setups for the calibration process of light intensity meters. Also the initial cost is much lesser and recurring cost involves periodic calibration of master Lux meter from National Laboratory. The new proposed system is compact and economic and can be employed in the existing setup of small scale laboratories. The third problem is the initial cost involved in manufacturing and setting up the equipment for these huge systems is very high. Since these systems are developed by apex laboratories they have dedicated setup and floor space. The second problem is the size of existing systems. The new proposed system is pragmatic to the commercial laboratories which can provide calibration facilities at small scale level. The existing calibration systems are available at the National Level laboratories and calibrating a Lux meter from these laboratories is inconvenient to the manufacturing industry spread along the stretch of the country. Illuminance level inside and outside a workplace, so that a required illuminance level can be achieved. Periodic calibrations need to be performed to detect and correct instrument error as an important element of any quality system.īy using the comparison calibration method, the performance of both the devices (UUT and Master device) and can be checked and used in applications to measure the Hence industries need to calibrate their lux meters periodically.
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These laboratories have a dedicated setup for lux meter calibration which includes setting up of dark room, optical bench, source lamp of specific lux range, pre-calibrated master lux meters from international laboratories, interfacing software and computerized process to control final product.
Lux meter calibration systems are available only at national level. During normal operation the characteristics of these meters deviate from the design characteristics due to wear and tear in the final product.
Light and calculate the correct shutter speed and aperture values required to capture an accurate exposure. In other words, it properly gauges the intensity of light that appears to the human eye. It can detect visible light, ultraviolet light as well as infrared rays of light. Lux meter is a photo-electronic device which is used in the measurement of illuminance in industries like paints and polymer, automobile, pharmacy, building automation as well as it is used on a large scale in photography. Keywords Calibration, Comparison method, Unit under test, Master lux meter, Photometry, Solid angle, Portable.
This project is feasible as compared to the older projects because it is portable, economic and IOT based. The importance of calibrating a lux meter is to monitor the intensity of light in an indoor environment ensuring that a correct amount of light falls on the iris of the eye. In this paper, the comparison calibration method is used where the industrial lux meter (unit under test) is compared against the pre-calibrated lux meter (master) against a light source simultaneously. Hence, lux meters need to be calibrated and repaired (if necessary) periodically. This can incur losses (monetary and material) and give an inferior quality of product. Lux meter being an electronic instrument undergoes wear and tear during its operation which results in imprecise and erroneous readings in measured lux value. Lux meters are used in a wide range of industrial applications as well as in hospitals, museums, photography etc. of Instrumentation Engineering Vidyavardhinis College of Engineering & Technology.ĪbstractLux meter is an illuminance measuring instrument used to measure the amount of light falling on a particular surface area at a particular distance from the source of light. Calibration of Lux Meter using Comparison Methodĭept of Instrumentation Engineering Vidyavardhinis College of Engineering & Technology.ĭept.