Abstract— An instrument designed for convenient determination of action spectra for cutaneous photo‐responses in man and experimental animals is described. Light from 450 W Xe lamp is dispersed by a concave holographic grating. The spectrum from 244 to 616 nm is projected as a planar strip (2 times 17 cm) intercepted by a grid with 31 ports. The bandwidth at each port is 12 nm and the size of the port increases from about 4 × 4 mm to 6 × 8 mm from the low to high wavelength limits, respectively. Typical fluence rates in quanta m‐2 s‐1 are 4.0 times 1019 at 298 nm, 16 times 1019 at 394nm and 22 times 1019 at 538 nm. Responses due to delayed erythema in normal skin and to musk ambrette photoallergy and solar urticaria in patients skin have been elicited with this instrument.
At certain small angles of the grating, any in-plane spectrometer will pass stray light that has been returned by the reflecting optics for a second diffraction. Paths of this source of stray light and its strueture have been calculated and confirmed experimentally.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.