Optoelectronic Sensor Systems

Visit Mid-Sweden University - November 2006

Prof. Dr. Arno Ruckelshausen Faculty of Engineering and Computer Science

Interdisciplinary Research Center Intelligent Sensor Systems (ISYS)

Optoelectronic Sensor Systems

Optoelectronic Sensor Systems

Overview

AutoScan: Online measurement in an agrcultural harvesting process

Light curtains

Optoelectronic Sensor Systems

OverviewOverviewOverview

AutoScan: Online measurement in an agrcultural harvesting process

Light curtainsLight curtainsLight curtains

Optoelectronic Sensor Systems

Sensor „AutoScan“: Automatic cutting length variation

Online-measurement of the degree of maturity for maize plants

Optoelectronic Sensor Systems

Spectrometer

Measurement of the light intensity as a function of the wavelegth

Physical Effect: Diffraction, optical grid

Sources: tec5, Zeiss

Optoelectronic Sensor Systems

Spectral characteristics of maize plants

Method: Spectrometer measurements è selective wavelengths

Optoelectronic Sensor Systems

Realization of the measurement principle

Optoelectronic Sensor Systems

LED

LED

Photo diode

Block diagram: AutoScan-Sensor

„brown“ maize

„green“ maize

Optoelectronic Sensor Systems

Boundary conditions and solution concept

Ø Measurement position

Ø Covering

Ø Optical measurement: feasibilty

Ø Fast measurement: 2 wavelengths

Ø Software for statistical analysis

Ø Microcontroller-based solution

Ø Self-cleaning effect (maize plants)

Optoelectronic Sensor Systems

Mechatronic System

Optoelectronic Sensor Systems

Field tests

Optoelectronic Sensor Systems

Ø Automatic online detection of the degree of maturity

Ø Automated optimization of the cutting length

Ø Stabile silage

Ø Automatic optimization of the animal food structure

Ø Electronic documentation (including GPS)

Ø Application of an optoelectronic system in rought boundary conditions

Ø Driver assistance

Results „AutoScan“

Optoelectronic Sensor Systems

OverviewOverviewOverview

AutoScanAutoScanAutoScan: Online : Online : Online measurement measurement measurement in an in an in an agrcultural harvesting processagrcultural harvesting processagrcultural harvesting process

Light curtains

Optoelectronic Sensor Systems

Quelle: “3D Imaging” , Tino Görtemöller, Christoph Höhn, Modul „Image Sensors“, Fachhochschule Osnabrück, WS04/05, weitere dort zitierte Quellen, insbesondere zur 3D-Kamera „SwissRanger“

3D-Imaging : Combining optical and distance information

Optoelectronic Sensor Systems

2D-Scanning of surfaces

Ø Coupling: Robot – optical distance sensor

Optoelectronic Sensor Systems

History of light curtains (1): Security / Safety

Quellen: www.hvbg.de www.lucom-gmbh.de

Optoelectronic Sensor Systems

Quelle: www.lucom-gmbh.de

History of light curtains (2): Extended data analysis

Optoelectronic Sensor Systems

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New application of light curtains: Sensor-based imaging

Optoelectronic Sensor Systems

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Pulsed version of a light curtain

Optoelectronic Sensor Systems

transmitter

receiver

Measuring distance

Beam distance

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receivertransmitter Latch

Architecture of the “HPS-HR“ (Height Profile Sensor / High Resolution)

Optoelectronic Sensor Systems

Data sheets (examples)

LED: SFH4501

Photo diode: BP104FS

Optoelectronic Sensor Systems

“1 bit imaging” or “Height profile sensor (HPS)“

Optoelectronic Sensor Systems

Optoelectronic Sensor Systems