Patent ID: 8402832
Filing Date: 2013-03-26
Classification: G01L

Abstract:
1. A pressure sensor for visually determining whether a particular pressure has been reached, the sensor comprising: a) a substrate having a planar surface; b) a pressure sensitive optical change layer present on said planar surface, said pressure sensitive optical change layer comprising a dye that undergoes an optical change reaction from a first optical state indicating that the particular pressure has not been reached to a second optical state indicating that the particular pressure has been reached; and c) an optically transparent layer positioned on top of said pressure sensitive optical change layer and configured to seal said pressure sensitive optical change layer from the external environment of said sensor wherein when the particular pressure has been reached said pressure sensitive optical change layer changes from said first optical state to said second optical state, and wherein said optically transparent layer acts as a visible means for viewing the optical change reaction that occurs as a result of the pressure sensor being subjected to the particular pressure.