Title: response time
Long Title: IUPAC Gold Book - response time
DOI: 10.1351/goldbook.R05345
Status: current
Index: quantity

Definition
The time required for the detector output to go from the initial value to a percentage (e.g. 99%) of the final value. In the case of an exponential behaviour of the detector \(\tau _{\rm{R}}\) can be related to the time constant \(\tau _{\rm{c}}\). The rise time \(\tau _{\rm{r}}\) is the time required for the detector output to vary between given percentages (e.g. from 10% to 90%) of the final value. Similarly, the fall time \(\tau _{\rm{f}}\) is the time required for the detector output to vary between given percentages (e.g. from 90% to 10%) of the initial value.

Related Term
- time constant: https://dev.goldbook.iupac.org/terms/view/T06376

Source
- PAC, 1995, 67, 1745. 'Nomenclature, symbols, units and their usage in spectrochemical analysis-XI. Detection of radiation (IUPAC Recommendations 1995)' on page 1751 (https://doi.org/10.1351/pac199567101745)

Other Outputs
- html: https://dev.goldbook.iupac.org/terms/view/R05345/html
- json: https://dev.goldbook.iupac.org/terms/view/R05345/json
- xml: https://dev.goldbook.iupac.org/terms/view/R05345/xml

Citation: Citation: 'response time' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.R05345
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Accessed: 2026-06-13T03:05:59+00:00