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Functional Principle, Technical Data
optoNCDT 1700
3. Functional Principle, Technical Data
3.1 Functional Principle
3.1.1 Diffuse Reflection
The optoNCDT1700 consists of an laser-optical
sensor and a signal conditioning electronics. The
sensor uses the principle of optical triangulation,
i.e. a visible, modulated point of light is projected
onto the target surface.
The diffuse element of the reflection of the light
spot is imaged by a receiver optical element
positioned at a certain angle to the optical axis of
the laser beam onto a high-sensitivity resolution
element (CCD), in dependency on distance. From
the output signal of the CCD element a digital
signal processor (DSP) in the sensor calculates
the distance between the light spot on the object
being measured and the sensor. The distance is
linearized and then issued via an analog or digital
interface.
Sensor
ILD1700
Analog output
0 VDC 4 mA
5 VDC (MMR) 12 mA
10 VDC (EMR) 20 mA
Midrange
Measuring range
SMR
Fig. 2 Definition of terms, output signal
SMR = Start of
measuring range
MMR = Midrange
EMR = End of
measuring range
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