Reflective Optical Sensors

Image sensors are devices that convert light waves or electromagnetic radiation that pass through or reflect off the object into a piece of information that constitutes an image. Image sensors are commonly used in photography and videography industries, for producing digital cameras, medical imaging equipment, night vision cameras, thermal imaging devices, radars, sonars etc. Image sensors are built from thousands of small light-sensitive cells that capture the light, recognise the colour and convert it into a digital signal. There are two main types of sensors on the market and they are CCD sensors and CMOS sensors.

CCD

In this sensor every light-sensitive cell is an analogue device. When light strikes the chip it is held as a small electrical charge in each photo cell. The charges in the line of pixels nearest to the (one or more) output amplifiers are amplified and output, then each line of pixels shifts its charges one line closer to the amplifier, filling the empty line closest to the amplifiers. This process is then repeated until all the lines of pixels have had their charge amplified and output.

CMOS

CMOS sensors are different in build from CCD sensors. CMOS image sensor has an amplifier for each pixel compared to the few amplifiers of a CCD. This results in less area for the capture of photons than a CCD, but this problem has been overcome by using micro lenses in front of each photodiode, which focus light into the photodiode that would have otherwise hit the amplifier and not be detected. CMOS sensors can potentially be implemented with fewer components, use less power, and/or provide faster readout than CCD sensors. They are also less vulnerable to static electricity discharges.


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Description Price Peak Sensor Distance Output Device Typical Rise Time Typical Fall Time Number of Channels Number of Pins Mounting Type Package Type Dimensions Height Length Maximum Operating Temperature Minimum Operating Temperature Width
RS Stock No. 124-6801
Mfr. Part No.RPR-220UC30N
BrandROHM
£1.91
Each (In a Pack of 5)
Units
6mm Phototransistor 10µs 10µs 1 4 Through Hole Radial 6.4 x 4.9 x 6.5mm 6.5mm 6.4mm +85°C -25°C 4.9mm
RS Stock No. 124-6800
Mfr. Part No.RPR-220
BrandROHM
£1.356
Each (In a Pack of 10)
Units
6mm Phototransistor 10µs 10µs 1 4 Through Hole Radial 6.4 x 4.9 x 6.5mm 6.5mm 6.4mm +85°C -25°C 4.9mm
RS Stock No. 182-8092
Mfr. Part No.RPI-121
BrandROHM
£0.775
Each (In a Pack of 20)
Units
1mm Phototransistor 10µs 10µs 1 4 Through Hole - 3.6 x 2.6 x 3.3mm 3.3mm 3.6mm +85°C -25°C 2.6mm
RS Stock No. 182-8100
Mfr. Part No.RPI-122
BrandROHM
£1.10
Each (In a Pack of 10)
Units
0.8mm Phototransistor 10µs 10µs 1 4 Through Hole - 3.6 x 3.4 x 3.3mm 3.3mm 3.6mm +85°C -25°C 3.4mm
RS Stock No. 182-6294
Mfr. Part No.BH1792GLC-E2
BrandROHM
£9.40
Each
Units
- Photodiode - - 1 10 Through Hole WLGA010V28 2.8 x 0.9 x 2.8mm 2.8mm 2.8mm +85°C -20°C 0.9mm
RS Stock No. 182-8087
Mfr. Part No.RPI-1035
BrandROHM
£2.58
Each (In a Pack of 5)
Units
- Phototransistor 10ms 10ms 1 6 Surface Mount - 3.9 x 3.9 x 2.4mm 2.4mm 3.9mm +85°C -25°C 3.9mm
RS Stock No. 182-8042
Mfr. Part No.RPR-220PC30N
BrandROHM
£2.534
Each (In a Tube of 2500)
Units
6mm Phototransistor 10µs 10µs 1 4 Through Hole - 6.4 x 4.9 x 6.5mm 6.5mm 6.4mm +85°C -25°C 4.9mm
RS Stock No. 182-8107
Mfr. Part No.RPR-220PC30N
BrandROHM
£5.564
Each (In a Pack of 5)
Units
6mm Phototransistor 10µs 10µs 1 4 Through Hole - 6.4 x 4.9 x 6.5mm 6.5mm 6.4mm +85°C -25°C 4.9mm
RS Stock No. 182-8085
Mfr. Part No.RPI-0125
BrandROHM
£0.413
Each (In a Pack of 10)
Units
1.2mm Phototransistor 10µs 10µs 1 4 Surface Mount - 3.6 x 3.3 x 2.8mm 2.8mm 3.6mm +85°C -25°C 3.3mm