Barcode Reader Flashcards
1
Q
What illuminates the barcode in a barcode reader?
A
Light from a laser
2
Q
What type of area reflects more light in a barcode?
A
White area
3
Q
What happens to light from the dark area of the barcode?
A
Less light is reflected
4
Q
What device captures the light reflected from the barcode?
A
Photoelectric cell
5
Q
What is generated by the photoelectric cell when it captures light?
A
A set of pulses
6
Q
The pulses generated correspond to which areas of the barcode?
A
Black and white areas
7
Q
The pulses generated by the barcode reader are converted to what?
A
Binary
8
Q
What is sometimes used for validation in barcode scanning?
A
Check digit
9
Q
Principles of Operation
A
- Light from laser illuminate barcode
- More light reflected from white areas than black
- light captured by photoelectric cells which generate a set of pulses corresponding to black and white areas
- pulses processed as binary
