UB EE 594 - DISTANCE DETECTION (12 pages)

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DISTANCE DETECTION



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DISTANCE DETECTION

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Pages:
12
School:
University at Buffalo, The State University of New York
Course:
Ee 594 - Consumer Opto-Electronics

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DISTANCE DETECTION EE 594 Consumer Optoelectronics Dave Vu March 17 1999 MOTIVATION My Motives Concept is simple Why others may be interested Distance Velocity measurement is an essential tool in many commercial and military applications Endless possibilities for future development and research OVERVIEW Many ways to detect distances using wave propagation properties visible light 380 770 nm infrared 800 nm microwaves 4000nm Laser Sources Best Detection Method depends on Level of Detection desired Application Specific Range of distance desired Error allowed Coherent Signals Pros Cons BASIC CONCEPT Emitter Direct a beam at approaching or receding object Receiver Portion of beam is reflected and received by Detection Unit Translation of Signal Point Light Source Flux Dens 1 distance2 Lasers Time dependent using c as reference Distance RT 2 Interferometry Phase Difference Distance Microwaves Frequency velocity POINT SOURCE Flux Density I d2 POINT SOURCE ERROR INTERFEROMETRY Used for very small distances Coherency same wavelength and phase Phase Difference and Position Other Applications Stress Stain Analysis MOIRE EFFECT Mechanical Interference of light by superimposed network of lines Incident Light Specimen Grating object Master Grating reference N 0 N 1 Actual Transmitted Light N 1 2 X N p where N Order p pitch of master SPEED DETECTION Radar Microwaves Supported by the Doppler Effect Frequency velocity beam of microwave energy 9000 28000nm hits target and a portion of it is reflected reflected beam is shifted in frequency proportional to velocity of target Signal Processing Scatterability Lasers Similar concept as radar except Coherent light source sample of change in distance over a period of time Accuracy of reading are affected by halogen lamps weather reflection and refraction of beam APPLICATIONS Commercial Vehicles Speed Regulation Personal use Room Dimensions Maufacturing Robotics Military Positioning Locating applications Education Research NASA NSF Shuttle



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