3. Detailed hardware specifications
The AF51 has a rated power consumption of 500 mW (supplied via the USB cable from
the host computer). Together with its USB cable and eyepiece clamp it weighs only 66 g.
The camera is composed of three components:
1. The OmniVision
®
OV5647 CMOS sensor and lens system.
2. A microcontroller USB 2.0 interface board with custom firmware that allows the user to
set various aspects of the sensor’s operation via the UVC protocol.
3. A 3D printed housing designed to allow practical use of the above two components.
The CMOS sensor and lens
•
Sensor brand and type: OmniVision
®
OV5647
CMOS sensor with RGB Bayer filter
•
Total pixels: 2624 columns x 1956 rows
(5,132,544 total pixels) with a primary colour
blue-green/green-red Bayer array arranged in line
alternating fashion (see figure 3.1). The array
includes active pixels (signals from which are
read out to form the image) and inactive pixels
(used for black level calibration).
•
Active array size: 2592 x 1944 (5 MP)
•
Image area: 3673.6
m
m x 2738.4
m
m
•
Optical projection characteristics: Suitable for a lens system that produces a ¼
inch diagonal image projection area and a chief ray angle of 24
°
.
•
Pixel size: 1.4 x 1.4 (
m
m )
•
Well capacity: 4.3 ke
-
•
Dark current: 16 mV/sec at 60
º
C
•
Temperature range (
º
C): Operational at -30 – 70, Stable image at 0 – 50.
•
Fixed pattern noise: <1% of V
peak-to-peak
•
Photosensitivity (without a lens): 680 mV/lux-sec
•
SNR: 36 dB
•
Dynamic range: 68 dB
OptArc AF51 Camera Page 21 of 99 User Guide v1.02
Figure 3.1 The Bayer mask
arrangement on the OV5647
