TFL05 Displacement

TFL05 Displacement - Displacement Measurement Unit...

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1 Displacement Measurement 2 Unit Objectives • Describe the various methods available to measure displacements • Present the physics associated with the operation of these devices • Examine the issues associated with using common displacement transducers
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2 3 Mechanical Measurement • Ruler (Accuracy and Resolution) • Micrometer External or Internal Hole Gauges • Vernier Caliper • Dial Indicator • Gauges Blocks and Surface Plates •Compa ra to rs 4 Displacement Transducers I • Potentiometer •LVDT • Capacitive 12 V Position Signal Secondary Coils Primary Coil Core Capacitor Plates
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3 5 Displacement Transducers II • Inductive • Piezoelectric • Strain Gauge + + + + ---- 6 Displacement Transducers III •Encode rs • Ultrasonic •O the r Spaces
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4 7 Potentiometer Transducers • Basically a standard potentiometer • Large operating range • Simple, robust, and inexpensive • Variable output voltage and impedance • Minimal conditioning • Resolution limited by the number of turns • Frequency response limited by “bounce” • Resistance to motion 8 Pot. Operating Principle V e V o R m R l R p R p p i x x 1 p i x x
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5 9 Potentiometer Performance Potetiometer Performance 0.0 0.2 0.4 0.6 0.8 1.0 0 1 02 03 04 05 0 Displacement (mm) Voltage Ratio      p i l p p i m p p i p i l p x x R R x x R R x x x x R R e o V V 1 1 1 1 / 1 R m /R p e max -------------------- 0.1 - 71.4% 1.0 - 20.0% 10.0 - 2.4% 10 Potentiometer Sizing Potentiometer D l d Wiper l d R D p 4 3 p e R V P / 2
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6 11 Typical Characteristics • Range – 10 mm to 500 mm • Repeatability – 0.002 mm • Linearity – 0.025% • Operating Frequency – 20 Hz • Output Resistance – 5 k • Maximum Voltage – 40 V • Mass – 25 g to 1.2 kg • Operating Force – 5 N 12 LVDT Transducers • Variable AC transformer
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  • Fall '10
  • JohnL
  • Strain Gauge Bridge Circuit Response, displacement transducers, Gauge Strain Gauge, common displacement transducers

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TFL05 Displacement - Displacement Measurement Unit...

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