Catalogue Optical Distance Sensors
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Benfits of Laser sensors
• Fast reaction
• Small spot captures tiny structures
• Higher accuracy on striped surface
• No problem with shiny surfaces near to object
• Visible spot
Function principle
Optical distance sensors measure position and presence of objects. The sensors use the triangulation priciple (fig.1). The spot isfocussed onto the objects surface. The reflected light is mapped on a position sensor (PSD or CCD). For the measurement only the diffuse reflection is relevant. For good results, the sensor needs approximately 10% of surface reflection. When the reflected light is too weak, and the regulation circuit can not compensate, the error LED comes on. For additional information the intensity output gives an analog output voltage pro­portional to the amount of reflected
light.
Two comparators can be set to detect individual threshold limits of the objects position for MIN, OK and MAX. The LEDs MIN, OK and MAX show the actual status. With the objects position (distance), the linear analog output voltage varies. With permanent monitoring the object position and light intensity are checked continuously.
The sensor system uses pulsed light. Therefore ambient light has barely no influence on the measure­ment.
Digital / analog sensors
Analog sensors use a fast PSD sensing element for detection, digital sensors use a CCD or CMOS line sensor element.
MEL analog sensors capture fast transients (crash testing, vibration analysis), reaction time is up to 2 us. Compensation of colour difference on surfaces works fast with analog MEL-sensors. Digital sensors were much slower. Digital sensors have their advantage at edges, when reflections form nearby objects radiate into the sensor. High precision digital sensors achieve good absolute precision independent from surface quality.
Phase shift measurement
MEL's M10L100m sensor uses light travelling time measurement. A laser beam is sent out, and in the axis of the beam, the reflection on the target is measured by compa­rison of the returning wave.
Mounting sensor head
In order to reach precise measure­ment result, the sensor head shall be mounted vertical to the object surface. Mounting in an angle causes measurement errors due to geometry.
General
Optical distance measurement systems are used in touchless measurement. The sensors have different range, spot size and reso­lution. The customer may select the best of many different models for his application.
Characteristics
• Adjustable integration time
• Analog output ±10 V, 4 ... 20 mA; RS232
• Resolution / accuracy sdown to 0,1 urn
• Insensitive to surface variations and colour
• Automatic adjustment on black surface
• Insensitive against ambient light upto20.000 LUX
• Thresholds far / OK / near adjustable
• Analog output for intensity of reflected light
• Error output for too much / not enough light
• Thickness measurement also on transparent objects
• Range from 0.5 mm to 400 mm and up to 30 (100) m
Typical Applications
• Check of dimensions
• Detection of position of small parts
• Detection of presence of parts on a conveyor manufacturer
• Detection of material overlap
• Position control of robot arm (tool center point)
• Detection of presence for parts
• Detection of position of parts through small holes
• Level monitoring
• Vibration analysis
• Crash testing
• Car handling test
Software for Interface
Software for the RS 232 interface and connecting cable are available on request.
Comparison :
LED- / Laser Sensors
Benefits of LED sensors
• No Laser safety regulations
• Bigger spot improves performance of rough targets
• Temperature range up to 70°C
Fig. 2
The sensor shall be mounted in a way, that looking into the beam can be avoided.
The LEDs MIN, OK and MAX help to adjust the sensor. Default settings of MIN, OK and MAX are the
_KAT-Optische-Sensoren_1-00-E
MAX, +24 V Distance output +10 V
Fig. 1 Triangulation principle
H^HMeHü MIKROELEKTRONIK GmbH • Tel. +49 89/327150-0 • Fax +49 89/319 20 23 • www.MELsensor.de
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