Related Experiment Video
Updated: Mar 16, 2026
09:18
Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
Published on: December 14, 2017
11.1K
Sources of Error in UV Radiation Measurements
1National Institute of Standards and Technology, Gaithersburg, MD 20899-8441.
Summary
Understanding ultraviolet (UV) radiation measurement is crucial for various applications. This study identifies common errors in UV meters, focusing on spectral response, calibration, and out-of-band measurements for accurate UV sensing.
Area of Science:
- Optics and Photonics
- Radiometry
- Instrumentation Science
Background:
- Growing commercial, scientific, and technical uses of ultraviolet (UV) radiation necessitate precise measurement instrumentation.
- Manufacturers are developing simplified, optically filtered UV meters to meet diverse application requirements.
- Accurate UV measurement is critical for applications ranging from industrial processes to scientific research and safety monitoring.
Purpose of the Study:
- To identify and analyze common sources of measurement error in ultraviolet (UV) meters.
- To provide insights into factors affecting the accuracy and reliability of UV radiation measurements.
- To guide users in understanding and mitigating potential inaccuracies in UV sensing.
Main Methods:
- Analysis of UV meter performance characteristics, including spectral response and calibration.
- Investigation of errors arising from spectral mismatch between calibration sources and measurement targets.
- Examination of out-of-band, non-linear, and non-ideal geometric/spatial responses.
- Assessment of the UV meter's response approximation to relevant action spectra.
Main Results:
- Instrument calibration uncertainty is significantly influenced by the spectral similarity between the UV meter's response and the source spectrum.
- Substantial measurement errors can be introduced by out-of-band spectral sensitivity, non-linear detector responses, and non-ideal spatial/geometric characteristics.
- The degree to which a UV meter's response matches the intended action spectrum is a critical factor for optimal application performance.
Conclusions:
- Accurate UV radiation measurement requires careful consideration of the UV meter's spectral characteristics and potential error sources.
- Understanding spectral mismatch, out-of-band response, and linearity is essential for reliable UV sensing.
- Optimal use of UV meters depends on aligning their spectral response with the specific application's action spectrum.
Related Concept Videos
01:12Types of Errors: Detection and Minimization
11.8K
Error is the deviation of the obtained result from the true, expected value or the estimated central value. Errors are expressed in absolute or relative terms.
Absolute error in a measurement is the numerical difference from the true or central value. Relative error is the ratio between absolute error and the true or central value, expressed as a percentage.
Errors can be classified by source, magnitude, and sign. There are three types of errors: systematic, random, and gross.
Systematic or...
Absolute error in a measurement is the numerical difference from the true or central value. Relative error is the ratio between absolute error and the true or central value, expressed as a percentage.
Errors can be classified by source, magnitude, and sign. There are three types of errors: systematic, random, and gross.
Systematic or...
11.8K
01:35Mutations
45.3K
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
45.3K
01:14UV–Vis Spectrometers
4.3K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
4.3K
01:20Random and Systematic Errors
15.7K
Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
15.7K
01:20Random and Systematic Errors
900
900
01:15Systematic Error: Methodological and Sampling Errors
11.3K
In the case of systematic errors, the sources can be identified, and the errors can be subsequently minimized by addressing these sources. According to the source, systematic errors can be divided into sampling, instrumental, methodological, and personal errors.
Sampling errors originate from improper sampling methods or the wrong sample population. These errors can be minimized by refining the sampling strategy. Defective instruments or faulty calibrations are the sources of instrumental...
Sampling errors originate from improper sampling methods or the wrong sample population. These errors can be minimized by refining the sampling strategy. Defective instruments or faulty calibrations are the sources of instrumental...
11.3K