The BC20 bar code scanner photodiode sensor is designed to measure scanned or intermittent beams. It has a swivel mount and a 10x10 mm aperture. It covers the spectral range 400-1100 nm and its power measuring range is 0.1-20 mW.
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bar-code-scanner-photodiode-sensor - Drawings
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Specifications
Aperture Size
10 x 10 mm
Material
Silicon
Spectral Range
400-1100 nm
Power Range
0.1 mW to 20 mW
Maximum Average Power Density
50 W/cm²
Dimensions
118 x 10 x 18 mm (LxWxD)
Use
1.5 m
CE Compliance
Yes
UKCA Compliance
Yes
China RoHS Compliance
Yes
Features
Measuring Power of Scanned Beams Using BC20
In this video, you will learn how the BC20 sensor enables correct power measurement of scanned beams, such as are used in barcode readers, laser shows and similarly challenging applications.
Measuring Very Low Laser Powers with a Photodiode Sensor
In this short “Basics” video, we review in general the use of photodiode sensors for measuring very low laser powers.
Ophir's Photodiode PD300 and PD300-1W sensors offer automatic background subtraction so the measurement is not sensitive to room light. With "filter out" (i.e. the external filter removed for low light measurements), 2 separate detector elements are visible. The beam to be measured is incident only on the outer of the 2 detectors, but background light reaches both detectors. The instrument will show the power measured by the outer detector minus that measured by the inner detector.This patented method cancels out 95% - 98% of background light under normal room conditions, even if it is constantly changing.
The BC20 has a peak measurement and hold circuit which measures the peak power on the detector and holds it. Therefore when a beam is scanned over the detector, when the beam is on the detector it goes up to a peak which corresponds to the same power the detector would measure if the beam was stationary and therefore the BC20 reads the correct power whether the beam is scanned or not. In order for the BC20 to do this, the beam must be on the detector (of size 10x10mm) for at least ~13µs and therefore this limits the scanning speed on the detector to 30,000 inch/s.
Ophir's Photodiode PD300 and PD300-1W sensors offer automatic background subtraction so the measurement is not sensitive to room light. With "filter out" (i.e. the external filter removed for low light measurements), 2 separate detector elements are visible. The beam to be measured is incident only on the outer of the 2 detectors, but background light reaches both detectors. The instrument will show the power measured by the outer detector minus that measured by the inner detector.This patented method cancels out 95% - 98% of background light under normal room conditions, even if it is constantly changing.
The BC20 has a peak measurement and hold circuit which measures the peak power on the detector and holds it. Therefore when a beam is scanned over the detector, when the beam is on the detector it goes up to a peak which corresponds to the same power the detector would measure if the beam was stationary and therefore the BC20 reads the correct power whether the beam is scanned or not. In order for the BC20 to do this, the beam must be on the detector (of size 10x10mm) for at least ~13µs and therefore this limits the scanning speed on the detector to 30,000 inch/s.
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