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Patent 1 206 260 granted to A. P. Predrick. (Oct. 23, 1969) A wavelength selective light screen permitting the passage of blue-violet light, but not red light, comprises a thin perforated sheet sandwiched between strengthening sheets.
Beam splitter Patent 1 206 461 granted to Electric and Musical Industries Ltd. (Jan. 8, 1968) A coil of wire is placed between two prisms of a beam splitter. Cement is introduced between the prisms, but is prevented by the wire from clouding the optical path.
π SIMILAR VOLUMES
Experimental set up for the FT-rheology experiments. The strain, torque and normal forces are digitized via a stand-alone PC and monitored in parallel via an oscilloscope. The rheometer is controlled via a second PC that allows to measure linear mechanical properties via the commercial software.
Fourier transform spectroscopy is a technique that uses interference of light rather than dispersion to measure the spectrum of a substance. The basis of this technique is the Fourier-pair relationship between the interferogram (interference function) of a substance and its spectrum. This relationsh
We consider a family of transforms which are generalizations of the Fourier transform on abelian groups. When the group under consideration is 7/, members of this family are characterized by having a matrix whose i,jth element is a(/j mod n), where a is any given vector. We address the problem of wh
Poly(styrene-acrylonitrile) (SAN) and acrylonitrile-[ethylene-propylene diene monomer (EPDM)]-styrene (AES) films were exposed to long-wavelength radiations (A > 300 nm) in the presence of atmospheric oxygen. Fourier transform infrared (b-T-IR) and Fourier transform Raman (FT-Raman) spectroscopy wer