Dual zone solar sensor

• US 6,084,228 A
• Filed: 11/09/1998
• Issued: 07/04/2000
• Est. Priority Date: 11/09/1998
• Status: Expired due to Fees

• Current Assignee: Control Devices Incorporated (Sensata Technologies Holding Plc)
• Original Assignee: Control Devices Incorporated (Sensata Technologies Holding Plc)
• Inventors: Harmon, Thomas E., Hill, Jonathan W.
• Primary Examiner(s): Allen, Stephone B.
• Application Number:
  US09/188,824
• Time in Patent Office: 603 Days
• Field of Search: 250/203.4, 250/239, 236/49.3, 236/78 B, 236/91 C, 236/1 B, 126/572, 126/573, 396/65, 396/274, 165/42
• US Class Current: 250/203.4
• CPC Class Codes: B60H 1/0075 the input being solar radiation
• CPC Class Codes: G01J 1/02 Details
• CPC Class Codes: G01J 1/0271 Housings; Attachments or accessories for photometers
• CPC Class Codes: G01J 1/4228 arrangements with two or more detectors, e.g. for sensitivity compensation
• CPC Class Codes: G01J 2001/4266 for measuring solar light

Abstract

The present invention relates to a dual zone solar sensor incorporating a calibratable diffuser overlying a vertically oriented circuit board having at least one photodetector affixed to either side of the circuit board in a vertical plane. Each detector preferably has a mutually exclusive hemispherical view. By mounting the photodetectors in the vertical plane, the dual zone solar sensor device is capable of providing information about the intensity of a source of incident solar radiation and the relative position of that source of radiation. While the angular responses of the photodetectors in their vertical orientation are very close to those desired by skilled artisans for a dual zone sensor, the addition of a diffuser that is slidable, and therefore calibratable, provides a method by which the angular response of each photodetector may be permanently calibrated to achieve a precise desired angular response. The present inventive combination of features eliminates the need for complex and bulky electronic signal processing circuitry and decreases the number of parts necessary to achieve functions previously achieved only by larger sensors having a far greater number of component parts.

Claims

1. A photosensor arrangement comprising:

a circuit assembly having a vertical axis, said vertical axis defining a vertical plane, at least one first side, and at least one second side opposite said at least one first side, said at least one first side and said at least one second side being located substantially in said vertical plane;

at least one first photosensor attached to said at least one first side;

at least one second photosensor attached to said at least one second side; and

a diffuser arranged substantially perpendicular to said vertical axis to overlie said at least one first and second photosensors, said diffuser being movable with respect to said at least one first and second photosensors;

wherein

said at least one first and second photosensors, respectively, have a substantially planar light-sensitive surface for receiving an input light from a source of light and further having an output terminal for providing an output electrical signal responsive to said input light; and

wherein

horizontal movement of said diffuser assembly determines a quantity of said input light transmitted to each of said at least one first and second photosensors.

2. The photosensor arrangement of claim 1, wherein said diffuser comprises:

a diffuser support; and

at least one diffuser lens mounted on said diffuser support.

3. The photosensor arrangement of claim 2, and further comprising a cap arranged substantially perpendicular to said vertical axis to overlie said diffuser and said circuit assembly.

4. The photosensor arrangement of claim 1, and further comprising an optic separator arranged substantially perpendicular to said vertical axis to overlie said diffuser and said circuit assembly to thereby create a bounded field of view for said at least one first and second photosensors.

5. The photosensor arrangement of claim 1, and further comprising a diffuser support configured to protect the circuit assembly from mechanical fatigue.

6. The photosensor arrangement of claim 4, and further comprising a diffuser support configured to protect the output terminals from mechanical fatigue.

7. A photosensor arrangement comprising:

a circuit assembly having a vertical axis, said vertical axis defining a vertical plane, at least one first side, and at least one second side opposite said at least one first side, said at least one first side and said at least one second side being located substantially in said vertical plane;

at least one first photosensor attached to said at least one first side;

at least one second photosensor attached to said at least one second side;

a diffuser arranged substantially perpendicular to said vertical axis to overlie said at least one first and second photosensors, said diffuser being movable with respect to said at least one first and second photosensors, said diffuser including;

a diffuser support; and

at least one diffuser lens mounted on said diffuser support;

an optic separator arranged substantially perpendicular to said vertical axis to overlie said diffuser and said circuit assembly to thereby create a bounded field of view for said at least one first and second photosensors; and

a cap arranged substantially perpendicular to said vertical axis to overlie said optic separator;

wherein

said at least one first and second photosensors, respectively, have a substantially planar light-sensitive surface for receiving an input light from a source of light and further having an output terminal for providing an output electrical signal responsive to said input light; and

wherein

horizontal movement of said diffuser assembly determines a quantity of said input light transmitted to each of said at least one first and second photosensors.

8. The photosensor arrangement of claim 7, and further comprising a diffuser support configured to protect the output terminals from mechanical fatigue.

9. A heating/cooling system control element for a vehicle, the heating/cooling system control element comprising:

a circuit assembly having a vertical axis, said vertical axis defining a vertical plane, at least one first side, and at least one second side opposite said at least one first side, said at least one first side and said at least one second side being located substantially in said vertical plane;

at least one first photosensor attached to said at least one first side;

at least one second photosensor attached to said at least one second side; and

a diffuser arranged substantially perpendicular to said vertical axis to overlie said at least one first and second photosensors, said diffuser being movable with respect to said at least one first and second photosensors;

wherein

said at least one first and second photosensors, respectively, have a substantially planar light-sensitive surface for receiving an input light from the source of light and further having an output terminal for providing an output electrical signal responsive to said input light; and

wherein

horizontal movement of said diffuser assembly determines a quantity of said input light transmitted to each of said at least one first and second photosensors.

10. The heating/cooling system control element of claim 9, wherein said diffuser comprises:

a diffuser support; and

at least one diffuser lens mounted on said diffuser support.

11. The heating/cooling system control element of claim 10, and further comprising a cap arranged substantially perpendicular to said vertical axis to overlie said diffuser and said circuit assembly.

12. The heating/cooling system control element of claim 9, and further comprising an optic separator arranged substantially perpendicular to said vertical axis to overlie said diffuser and said circuit assembly to thereby create a bounded field of view for said at least one first and second photosensors.

13. The heating/cooling system control element of claim 9, and further comprising a diffuser support configured to protect the output terminals from mechanical fatigue.

14. The heating/cooling system control element of claim 13, and further comprising a diffuser support configured to protect the output terminals from mechanical fatigue.