SINGLE BEAM OPTICAL APPARATUS AND METHOD
First Claim
1. A single-beam optical apparatus suitable for measuring thermal diffusivity of a sample, the apparatus comprising:
- a laser source generating a focused laser beam capable of heating a portion of the sample so as to create a thermal bump via thermal dilation, the thermal bump reflecting a reflected portion of the focused laser beam;
means for modulating the intensity of the laser beam;
an aperture;
a sensor positioned relative to the reflected portion of the focused laser beam so as to generate a measured signal from the reflected portion of the focused laser beam that passes through the aperture; and
a module for determining at least the parameters of a relationship between a property of the thermal bump and the measured signal.
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Abstract
A single-beam optical apparatus suitable for measuring thermal diffusivity of a sample having a laser source generating a focused laser beam capable of heating a portion of the sample so as to create a thermal bump via thermal dilation, the thermal bump reflecting a reflected portion of the focused laser beam, means for modulating the intensity of the laser beam, an aperture, a sensor positioned relative to the reflected portion of the focused laser beam so as to generate a measured signal from the reflected portion of the focused laser beam that passes through the aperture, and a module for determining at least the parameters of a relationship between a property of the thermal bump and the measured signal.
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Citations
25 Claims
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1. A single-beam optical apparatus suitable for measuring thermal diffusivity of a sample, the apparatus comprising:
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a laser source generating a focused laser beam capable of heating a portion of the sample so as to create a thermal bump via thermal dilation, the thermal bump reflecting a reflected portion of the focused laser beam; means for modulating the intensity of the laser beam; an aperture; a sensor positioned relative to the reflected portion of the focused laser beam so as to generate a measured signal from the reflected portion of the focused laser beam that passes through the aperture; and a module for determining at least the parameters of a relationship between a property of the thermal bump and the measured signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A single-beam optical method suitable for measuring thermal diffusivity of a sample, the method comprising the steps of:
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(a) generating a focused laser beam; (b) modulating the laser beam; (c) heating a portion of the sample using the focused laser beam; (d) creating a thermal bump via thermal dilation as a result of the heating step; (e) reflecting a reflected portion of the focused laser beam off of the thermal bump; (f) generating a measured signal from the reflected portion of the focused laser beam; and (g) determining at least the parameters of a relationship between a property of the thermal bump and the measured signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification