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Laser diffraction analysis is originally based on the Fraunhofer diffraction theory, stating that the intensity of light scattered by a particle is directly proportional to the particle size. [4] The angle of the laser beam and particle size have an inversely proportional relationship, where the laser beam angle increases as particle size ...
Generally shorter wavelength lasers give stronger Raman scattering due to the ν 4 increase in Raman scattering cross-sections, but issues with sample degradation or fluorescence may result. [12] Continuous wave lasers are most common for normal Raman spectroscopy, but pulsed lasers may also be used. These often have wider bandwidths than their ...
In 1988, the first Raman fiber laser based on fiber Bragg gratings has been made. [4] Fiber Bragg gratings are narrow-band reflectors and act as the mirrors of the laser cavity. They are inscribed directly into the core of the optical fiber used as the gain medium, which eliminates substantial losses that previously arose due to the coupling of ...
The Emerson "Heat Fan", the first ceiling fan to use a stack motor A close-up of the dropped flywheel on a FASCO "Charleston" ceiling fan Stack-motor ceiling fans. In the late 1970s, due to rising energy costs prompted by the energy crisis , Emerson adapted their "K63" motor, commonly used in household appliances and industrial machinery, to be ...
Casablanca Fan Company is a ceiling fan manufacturer founded in 1974. It has been a subsidiary of Hunter Fan Company since 1996, and is currently based in Memphis, Tennessee . Casablanca became known in the late 1970s for marketing their premium and luxury ceiling fans as furniture, and Casablanca continues to operate today as Hunter's luxury ...
Pulsed FT spectrometry gives the advantage of requiring a single, time-dependent measurement which can easily deconvolute a set of similar but distinct signals. The resulting composite signal, is called a free induction decay, because typically the signal will decay due to inhomogeneities in sample frequency, or simply unrecoverable loss of ...