Two-channel fiber optic skin erythema meter

Harri Kopola, Arto Lahti, Risto Myllylä, Matti Hannuksela

Research output: Contribution to journalArticleScientificpeer-review


The skin erythema meter is a fiber optic, dual-wavelength reflectance meter that measures the reflectance of the skin on two wavelengths, one the blood/hemoglobin absorption band (555 nm) and another a reference (660 nm). The instrument consists of a fiber optic sensor head, a microprocessor-based control and analysis unit, and a plotter, and it presents the relation between the measured reflectance results in terms of a reflectance index [R(555 nm):R(660 nm)]. The measurement cycle, including printing, takes 5 s. Stability tests on the erythema meter (constant distance, reference object) showed the standard deviation of the reflectance index to be ± 0.1%, whereas that in repeatability tests was less than ± 0.5% for skin and less than ± 0.2% for paper with handheld positioning and repetition. The dynamic change in the reflectance index was about 30% with strong irritation. Results of various irritation test series on human skin are also presented. Finally, the performance and applicability of the skin erythema meter with respect to allergy test procedures, irritancy testing, and measurement of uv-induced erythema are discussed.
Original languageEnglish
Pages (from-to)222-226
JournalOptical Engineering
Issue number2
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed


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