Pavement ice detector
First Claim
Patent Images
1. A pavement ice detector comprising:
- a sensor imbedded in the pavement, a semi-permeable mesh on the top surface of said sensor, a timer and air pump creating a puff of air exhausting through said sensor and a means to signal the buildup of air pressure in said sensor.
0 Assignments
0 Petitions
Accused Products
Abstract
A small puff of air is periodically exhausted through a semi-permeable stainless mesh (23) filter upward through the plane of the roadway surface. The puff of air is created by a miniature air pump (14) and timer, typically On one half second and Off 30 seconds. The timing can be adjustable. The puff of air is delivered to the sensor (20) through hose (5). When ice on pavement has formed over the sensor (20), it blocks the release of the air puff. This causes pressure to build up, triggering the pressure switch (16) which then turns on output switch (17) which can then be used to turn on any number of warning devices.
23 Citations
5 Claims
-
1. A pavement ice detector comprising:
- a sensor imbedded in the pavement, a semi-permeable mesh on the top surface of said sensor, a timer and air pump creating a puff of air exhausting through said sensor and a means to signal the buildup of air pressure in said sensor.
- View Dependent Claims (2, 3, 4, 5)
Specification