Pavement ice detector

Details Pavement ice detector Pavement ice detector

1996-02-01

1998-01-20

Hofsass, Jeff

Communications: electrical

External condition vehicle-mounted indicator or alarm

Highway information

340901, 340580, 340962, 73 37, G08G 109

Patent

active

057105545

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.

REFERENCES:
patent: 2641928 (1953-06-01), Howell
patent: 2699537 (1955-01-01), Sederstrom
patent: 2755456 (1956-07-01), Bursack
patent: 2953021 (1960-09-01), Goettelman
patent: 3057198 (1962-10-01), Crouchman
patent: 3086393 (1963-04-01), Silverschotz
patent: 4053127 (1977-10-01), Edington
patent: 4897597 (1990-01-01), Whitener
patent: 5301905 (1994-04-01), Blaha
patent: 5416476 (1995-05-01), Rendon
patent: 5484121 (1996-01-01), Padawer et al.

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