optical window


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optical window

See atmospheric windows.

optical window

[′äp·tə·kəl ′win·dō]
(optics)
The spectral region between 300 and 2000 nanometers (0.3 and 2 micrometers in wavelength), in which visible and near-visible radiation will pass through the earth's atmosphere.
References in periodicals archive ?
It is also important to remind the limit given by the reduced extension of the optical window, which does not grant the access to the near-wall region, where usually autoignition occurs.
Finally, if we take into account only visible radiation (400 nm-750 nm) absorption effect, the optical window constructed in this work permits near to 83% of visible radiation reach to absorbent layer; results indicated that system In(O;OH)S/i-ZnO/[n.sup.+]-ZnO has suitable optical properties to be used as optical window in thin film solar cells.
The transfer matrixes of optical window substrate [M.sub.win] can be obtained using a transfer matrix theory of optical thin-films [20-22].
A special optical window is required to do the latter measurements.
Common Causes of Error in Values Obtained by Glucose Testing Meters * Lack of quality control in hospital ward * Fingertip not dry * Insufficient blood sample because of inappropriate choice of site faulty use lancing device, or subcutaneous tissue atropy due to extensive neurovascular changes in the fingertip * Inappropriate or outdated reagent strips * Instrument with dirty optical window * Failure of the provider to reassess the patient's technique, of the patient to maintain equipment, or of the patient or of to obtain further education about technique and equipment Several other common problems may account for testing errors by hospital personnel and patients or their caretakers using the meters.
Another improvement on Jerry's scope is the curved-vane spider for the secondary mirror used in place of the Astroscan's optical window. "I wanted to use an optical window, but I couldn't find anything optically flat enough at a price I could afford," Jerry notes.
First overtones of C-H vibrations are located within this optical window. The high CH content of body fat is evident within in vivo spectra, in which fat absorption is observed as two strong, overlapping absorbance bands centered at 5790 and 5690 [cm.sup.-1].
With each oscillation, the sample is stretched and contracted while laser beams, directed through the sample via an optical window, obtain analytical data.
The hand is placed palm down on a flat surface beneath a light shield, with the examined finger pressed against a 15-mm diameter optical window that is illuminated from below by multiple light-emitting diodes (LEDs) located azimuthally around a 14[degrees] half-angle cone.
Initially, he envisaged a form of Newtonian with the secondary mirror held in the center of the optical window, a scheme that avoided the secondary-mirror holder that creates diffraction spikes around bright stars.
I did consider supporting the diagonal on an optical window, eliminating a spider altogether, but the optical quality of such a window must be quite high.
To eliminate spider vanes altogether, the secondary mirror can be supported by an optical window -- or, in the case of Schmidt-Cassegrains and Maksutovs, by the corrector lens.