Systems and methods for measuring a profile characteristic of a glass sample
First Claim
1. A system for performing a refracted near-field (RNF) measurement of a profile characteristic of a glass sample disposed adjacent a reference block having a top surface, comprising:
- a light-source system that generates polarized light;
a polarization-switching system that receives and switches the polarization of the polarized light between first and second orthogonal polarizations to form a polarization-switched light beam;
a reference detector system arranged to receive a portion of the polarization-switched light beam and form a polarization-switched reference detector signal;
an optical system configured to scan the polarized-switched light beam through the glass sample and the reference block at different depths into the glass sample;
a signal detector system arranged to receive, over an angular range within 26°
to 45°
relative to normal incidence, the polarization-switched light beam transmitted through the glass sample and the reference block, and form in response a polarization-switched detector signal; and
a signal-control-and-processing system operably configured to move the reference block and sample and receive and process the polarization-switched reference and detector signals to determine a profile characteristic of the glass sample.
1 Assignment
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Accused Products
Abstract
Systems and methods for measuring a profile of a glass sample (300) are disclosed. The method includes scanning a polarization-switched light beam (112PS) through the glass sample and a reference block (320) for different depths into the glass sample to define a transmitted polarization-switched light beam. The method also includes measuring an amount of power in the polarization-switched light beam to form a polarization-switched reference signal (SR), and detecting the transmitted polarization-switched light beam to form a polarization-switched detector signal (SD). The method further includes dividing the polarization-switched detector signal by the polarization-switched reference signal to define a normalized polarization-switched detector signal (SN). Processing the normalized polarization-switched detector signal determines the profile characteristic.
114 Citations
20 Claims
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1. A system for performing a refracted near-field (RNF) measurement of a profile characteristic of a glass sample disposed adjacent a reference block having a top surface, comprising:
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a light-source system that generates polarized light; a polarization-switching system that receives and switches the polarization of the polarized light between first and second orthogonal polarizations to form a polarization-switched light beam; a reference detector system arranged to receive a portion of the polarization-switched light beam and form a polarization-switched reference detector signal; an optical system configured to scan the polarized-switched light beam through the glass sample and the reference block at different depths into the glass sample; a signal detector system arranged to receive, over an angular range within 26°
to 45°
relative to normal incidence, the polarization-switched light beam transmitted through the glass sample and the reference block, and form in response a polarization-switched detector signal; anda signal-control-and-processing system operably configured to move the reference block and sample and receive and process the polarization-switched reference and detector signals to determine a profile characteristic of the glass sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of measuring a profile characteristic of a glass sample disposed adjacent a reference block having a top surface, comprising:
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scanning a polarization-switched light beam through the glass sample and the reference block for different depths into the glass sample to define a transmitted polarization-switched light beam; measuring an amount of power in the polarization-switched light beam to form a polarization-switched reference signal; detecting the transmitted polarization-switched light beam to form a polarization-switched detector signal; dividing the polarization-switched detector signal by the polarization-switched reference signal to define a normalized polarization-switched detector signal; and processing the normalized polarization-switched detector signal to determine the profile characteristic of the glass sample. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of measuring a profile characteristic of a glass sample disposed adjacent a reference block, comprising:
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generating a polarization-switched light beam that is switched between orthogonal polarizations at a rate of between 1 Hz and 50 Hz; measuring an amount of power in the polarization-switched light beam and generating a polarization-switched reference signal, wherein the measured amounts of power in each of the orthogonal polarizations are within 50% of each other; transmitting the polarization-switched light beam through the glass sample and reference block for different depths into the glass sample; relaying the transmitted polarization-switched light beam to a signal photodetector using a relay optical system, with the signal photodetector generating a polarization-switched detector signal; dividing the detector signal by the reference signal to form a normalized detector signal; and determining the profile characteristic of the glass sample from the normalized detector signal. - View Dependent Claims (18, 19, 20)
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Specification