Sky sensor
A sky sensor device for measuring direct normal illuminance (DNE) value is described. One sky sensor device includes a camera sensor to capture a series of images, an illuminance sensor to measure illuminance, and a processing device coupled to the camera sensor and the illuminance sensor. The processing device determines a DNE value using the series of images and the illuminance.
1. A sky sensor device comprising:
a camera sensor to capture a series of images;
an illuminance sensor to measure illuminance; and
a processing device coupled to the camera sensor and the illuminance sensor, the processing device to determine a direct normal illuminance (DNE) value using the series of images and the illuminance.
2. The sky sensor device of claim 1 , further comprising an enclosure, wherein:
the camera sensor is located on a top surface of the enclosure at a first position; and
the illuminance sensor is located on the top surface of the enclosure at a second position different than the first position.
3. The sky sensor device of claim 2 , wherein the camera sensor and the illuminance sensor are located on a same plane.
4. The sky sensor device of claim 2 , wherein the camera sensor is located on a first plane, and the illuminance sensor is located on a second plane different from the first plane.
5. The sky sensor device of claim 1 , further comprising:
a first cylindrical housing, wherein the camera sensor is located on a top surface of the first cylindrical housing; and
a second cylindrical housing adjacent to the first cylindrical housing, wherein the illuminance sensor is located on a top surface of the second cylindrical housing.
6. The sky sensor device of claim 5 , further comprising a dome located above the camera sensor, wherein the illuminance sensor is located at a location such that the dome causes between zero and ten degrees of obstruction to the illuminance sensor.
7. The sky sensor device of claim 6 , wherein the top surface of the first cylindrical housing has a slope from a first plane in which the camera sensor is located to a second plane, wherein the illuminance sensor is located in the second plane.
8. The sky sensor device of claim 6 , wherein a distance between the camera sensor and the illuminance sensor is equal to or greater than a sum of a radius of the first cylindrical housing and a radius of the second cylindrical housing.
9. The sky sensor device of claim 1 , further comprising an enclosure comprising:
a recessed channel on a top surface of the enclosure; and
a drain coupled between the recessed channel and a side of the sky sensor device, wherein the illuminance sensor is located in the recessed channel.
10. The sky sensor device of claim 1 , further comprising a transparent dome located over the camera sensor.
11. The sky sensor device of claim 1 , wherein the camera sensor is a 360-degree high dynamic range (HDR) camera sensor.
12. The sky sensor device of claim 1 , further comprising:
a circuit board;
a first integrated circuit comprising the camera sensor coupled to the circuit board;
a second integrated circuit comprising the processing device, wherein the processing device is coupled to the circuit board; and
a connector coupled to the circuit board, the connector to receive at least one of a data cable or a power cable.
13. The sky sensor device of claim 1 , wherein the DNE value is an amount of illuminance in the visible spectrum and is indicative of a sky condition in a field of view of the sky sensor device, the sky condition relating to glare from the sun on a window near the sky sensor device.
14. The sky sensor device of claim 13 , wherein the processing device is to report the sky condition to an electrochromic window system for controlling a tint level of one or more electrochromic windows of the electrochromic window system based on the sky condition.