Optical spectra definition9/1/2023 See for instance applications like hazard measurements or measurement of PAR (Photocynthetically Active Radiation). Particularly with respect to certain biological reactions, the term “action spectrum” is often used instead of “spectral sensitivity”. DNA damage, formation of erythema (sunburn) and of non-melanoma skin cancer, tanning of the human skin and the photosynthesis process in green plants, which have been studied and quantified by spectral sensitivity. Spectral sensitivity functions such as the CIE photopic response have also been defined in other biological effects of optical radiation, e. g. This is different from the definition by two of the main standardization authorities, the CIE and DIN, who define the UVA range as being between 315 nm and 400 nm. For example, the US Food and Drug Administration (FDA) and the US Environmental Protection Agency (EPA) define the UV-A range as being between 320 nm and 400 nm. Since the strength of radiation effects on matter does not change abruptly with wavelength, different authors define UVA and UVB ranges slightly different. Any group of spectra which are within 2 arcsec of each other are considered to be of the same object, and only one of them is designated as sciencePrimary. For instance, the UV-B range covers the wavelengths in the solar spectrum which is particularly responsible for DNA damage that causes melanoma and other types of skin cancer. Instead, it is largely motivated by the effects of the electromagnetic wave on matter. It must be emphasized that this classification of electromagnetic radiation is a matter of convention and is not based on qualitative properties of the electromagnetic wave itself. 1: Wavelength ranges of electromagnetic radiation. If calibrated to radiometric units, they are referred to as spectroradiometers.įig. Devices to perform spectrally resolved optical radiation measurements are called spectrometers in general terms. Optical radiation with wavelengths longer than 830 nm is called infrared radiation (IR) and is similarly divided into IR-A, IR-B and IR-C. Optical radiation with wavelengths shorter than 400 nm is called ultraviolet (UV) radiation and is further subdivided in UV-A, UV-B and UV-C ranges. The terms “light” and “visible radiation” (VIS) refer to the wavelength range between 360 nm and 830 nm, which can be perceived by the human eye. The chapter presents the results of researching these areas conducted by the authors, which are completely original.1.1 The optical radiation wavelength rangeĪccording to DIN 5031, the term “optical radiation” refers to electromagnetic radiation in the wavelength range between 100 nm and 1 mm. Studies were conducted in different regions of the country and combined the efforts of several scientific groups of researchers. The chapter presents the results of experiments conducted by a team of researchers, which allowed to determine the technological process indicators of growing green vegetable crops in a man-made environment, and also to develop designs for small-sized irradiation chambers with automatic control, both for laboratory research and for small business and private use. The purpose of the presented research is to study the process of growing plants in a man-made environment, the main influencing factor of which is the man-made sources (LEDs) emission, as well as to design and construct the installation (irradiation chamber) for implementation of the studied technology. The object of the research in the chapter is green vegetable crops grown in a manmade environment.
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