|Single side reading||Read the front side of the OMR form|
|Dual Side Reading||Read both sides of the OMR form|
: Each sensor can recognize Marks and Timing Marks directly.
Every marks need to print on the same position of reading sensors.
|Type of sensor||Wave length||Mark Implements||Dropout color||Readable color|
|Infrared sensor(IR)||940nm||Pencil||Colors other than readable color||Black, Blue, Pigments|
|Visible sensor (VR)||660 nm||Pencil + Pen||Red , Orange , Pink||Black, Blue|
Infrared light can not see by naked eye.
Infrared sensor(Pencil read sensor)
Image : Infrared light can not see by naked eye.
Image : Dropout mark frames
Red lights onto mark frames
- Example: Red , Orange, and Pink are dropout by visible red light
- Blue line can not drop out by the visible red light