OCB100-KIT Datasheet, PDF (10/24 Pages) OPTEK Technologies – Auto-Calibration Design Kit

THEORY OF OPERATION OPB732 / OPB732WZ
The OPB732 (PCB mount, no mounting tabs) and OPB732WZ
(mounting tabs and wires) are non-focused analog output reflective
sensors designed to operate from .05” [1.27mm] to 2”[50.8mm] or
greater with an output signal significantly above the typical back-
ground signal in a dark environment. These sensors are tested against
a white 90% reflectance white card at a distance of 1.0” to guaran-
tee a minimum Ic_(ON) collector current of 0.25mA @ VCE = 0.4V and
IF = 30mA. Other surfaces will give different signal levels.
Infrared light with a center wavelength of about 850nm is emitted
from an LED with a total half power angle (ØHP, Beam Angle) around
10 ^{18°. When the light strikes an object, it is reflected back toward}
the phototransistor. The amount of current Ic_(ON) generated from the
phototransistor is dependent upon the amount of light striking it. The
following graph shows the effect of target distance on the output
current of the OPB732.
OCB100-KIT