With their internal gain mechanism, large dynamic range and fast rise time, the APDs are ideal for lidar systems for optical distance
measurement and object recognition, according to the time of flight method.
The sensor is based on an optical distance
measurement, which takes place by means of the LIDAR ("light detection and ranging") method.
The earphone-type sensor contains an optical distance sensor that uses light for taking measurements.
The earphone-type sensor has the same shape as an inner-ear-type earphone and is fitted with an optical distance sensor, QRE1113 (Fairchild Semiconductor International Inc., California, USA), which has an infrared LED and a phototransistor built in.
The interference pattern will change from bright to dark or dark to bright, if the extra optical distance traveled for the beam that has passed through the space or vacuum polarized by scalar fields is given by
The interference pattern does not change, if the extra optical distance is a whole number of the light wavelength, i.e.
Removing the filter completely changes the effective optical distance
between a lens and the sensor, which can prevent some camera lenses from focusing on distant subjects.
Figure 6(a) compares the variations in the Q-factor with the optical distance
for bit error rate analyzers (I) & (II).It is investigated from the figure that the Q values shows a considerable fall with the increase in the length of optical fiber.
These findings are consistent with several studies showing that accommodation is most accurate (Johnson, 1976) and oculomotor adaptation is minimal (Ebenholtz, 1992; Miller, Pigion, Wesner, & Patterson, 1983) for visual tasks located at the optical distance
of the dark focus.
The lamp also works as a no touch measurement system when used as an ODI or optical distance
The first is the optical distance
at which HUD imagery should be focused and its effects on perceptual judgments of objects in the outside scene.