CA2520651A1 - Compact moisture sensor with efficient, high obliquity optics - Google Patents

Compact moisture sensor with efficient, high obliquity optics

Info

Publication number
CA2520651A1
CA2520651A1 CA002520651A CA2520651A CA2520651A1 CA 2520651 A1 CA2520651 A1 CA 2520651A1 CA 002520651 A CA002520651 A CA 002520651A CA 2520651 A CA2520651 A CA 2520651A CA 2520651 A1 CA2520651 A1 CA 2520651A1
Authority
CA
Canada
Prior art keywords
windshield
focuser
collimator
housing
coupler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002520651A
Other languages
French (fr)
Other versions
CA2520651C (en
Inventor
Rein S. Teder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pilkington North America Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/951,922 external-priority patent/US5898183A/en
Application filed by Individual filed Critical Individual
Publication of CA2520651A1 publication Critical patent/CA2520651A1/en
Application granted granted Critical
Publication of CA2520651C publication Critical patent/CA2520651C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Compact moisture sensor (10) mounted on inner surface (30) of windshield (18) to detect moisture on outer surface (32) and control windshield wipers (20), includes coupler (24) having collimator (37) and focuser (42) and housing (28) detachable covering coupler. Planar circuit board (26) disposed within housing (28) includes emitters (56) and detectors (58) mounted such that the axes of emission and detection are perpendicular to windshield (18) when housing (28) is secured to coupler (24). Collimator (37) and focuser (42) are disposed adjacent emitter (56) and detector (58) such that the optical axes of collimator (37) and focuser (42) form oblique angles with respect to emission and detection axes. Two emitters and two detectors are used to form four optical paths of equal length and optical efficiency. In operation, a light beam from emitter (56) enters windshield (18) at a forty-five degree angle and is reflected back from outer surface (32) of windshield (18) to detector (59), which generates a control signal based on the amount of light reflected from the outer surface.
CA002520651A 1997-10-16 1998-10-05 Compact moisture sensor with efficient, high obliquity optics Expired - Fee Related CA2520651C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/951,922 US5898183A (en) 1997-10-16 1997-10-16 Compact moisture sensor with efficient high obliquity optics
US08/951,922 1997-10-16
CA002302660A CA2302660C (en) 1997-10-16 1998-10-05 Compact moisture sensor with efficient, high obliquity optics

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002302660A Division CA2302660C (en) 1997-10-16 1998-10-05 Compact moisture sensor with efficient, high obliquity optics

Publications (2)

Publication Number Publication Date
CA2520651A1 true CA2520651A1 (en) 1999-04-29
CA2520651C CA2520651C (en) 2008-07-22

Family

ID=35452259

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002520651A Expired - Fee Related CA2520651C (en) 1997-10-16 1998-10-05 Compact moisture sensor with efficient, high obliquity optics

Country Status (1)

Country Link
CA (1) CA2520651C (en)

Also Published As

Publication number Publication date
CA2520651C (en) 2008-07-22

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Effective date: 20141006