Method to detect non-spherical particles using orthogonally polarized light
First Claim
Patent Images
1. A system comprising:
- a process chamber; and
a particle monitor that uses a linearly-polarized laser beam to detect the concentration of non-spherical particles in said chamber.
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Abstract
A structure and a method provide a quasi bright field particle sensor for the detection of non-spherical particles, using a laser beam of predetermined polarization. A phase shift caused by non-spherical particles passing through the laser beam is utilized to detect the presence of such particles. In one embodiment, a single laser beam is used to detect the concentration of non-spherical particles in the pump line receiving the exhaust gas from a process chamber.
32 Citations
10 Claims
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1. A system comprising:
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a process chamber; and a particle monitor that uses a linearly-polarized laser beam to detect the concentration of non-spherical particles in said chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for measuring the concentration of non-spherical particles in a process chamber comprising the steps of:
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sending a single beam of linearly polarized light from a laser source to a detector opposite said laser source; and measuring the rotation in polarization in said beam of polarized light, when a non-spherical particle passes through the beam. - View Dependent Claims (9, 10)
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Specification