CA2520651A1 - Compact moisture sensor with efficient, high obliquity optics - Google Patents
Compact moisture sensor with efficient, high obliquity opticsInfo
- 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
Links
Landscapes
- 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.
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) |
-
1998
- 1998-10-05 CA CA002520651A patent/CA2520651C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2520651C (en) | 2008-07-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20141006 |