REU SUMMER 2012 SENSOR PROJECT

Alan Young7/5/12

Mechanical Sensing System

• Goals for project– Conduct initial literature review– Select an appropriate distance sensor and a

pressure sensor to interface with a system– Use LabVIEW to measure the signals from the

sensors and display on a computer

Literature Review

• How to use sensors for distance measurement: http://www.waset.org/journals/waset/v51/v51-51.pdf

• How to use sensors for pressure measurement: http://www.emant.com/250001.page

Rough sketch of mechanical system

Mechanical Sensor System Base

• Borrowed base from the Nanofab laboratory

• Displacement Sensor will attach a cylinder

• Pressure sensing pad will be located under the cylinder

Uses for project

• Assembly line worker• Robotics research• Automated stamper• Robot that can type on a keyboard• Research ways to incorporate sensors to any

mechanical system

Displacement Sensors

SICK Displacement sensor

Model name: SICK DT10 Type: Red LED Sensor• https://impurchasing.mysick.com/partner

Portal/TopFrameset.aspx?lefttarget=../ProductCatalog/Leftnav.aspx%3Fcategory=Produktfinder&righttarget=../ProductCatalog/Datasheet.aspx%3FProductID=41543

• 50 mm to 500 mm range• 3 mm resolution• Analog output, Cable interface• 2m Cable costs $50• Need to put wires onto a DAQ, which

plugs in via USB to a computer• Works with NI DAQ:

http://sine.ni.com/np/app/main/p/ap/daq/lang/en/pg/1/sn/n17:daq,n36:18/

• $359• Needs a power supply (on-off switch)

Keyence Laser distance sensor

Model name: Keyence IL-100 Type: Laser• http://www.keyence.com/p

roducts/sensors/laser/il/il_specifications_1.php?style=print

• $1,490• $299 RS-232 adapter OR• 4-20mA or -5 to 5V outputs

Tactile Sensors

Force Imaging Array from UneoTech

• http://www.uneotech.com/ucctw/index.php?option=com_k2&view=item&layout=item&id=173&Itemid=147&lang=en

• $10,000• Comes with sensor pad,

electronics controller, and software

Pressure Sensing Sheet from Sensible UI

• http://www.sensibleui.com/buy

• Initial Resolution: 4.5mm

• $399.00• USB interface with

computer• Sold out!!!

Interface Options

Data Acquisition Board

• http://sine.ni.com/nips/cds/view/p/lang/en/nid/208789

• NI 9219• $ 926.10• Need to make sure one

or both sensors are compatible with the DAQ

Distance Sensor Interfaces

SICK DT10 • Has an analog voltage or

current that can be plugged into the DAQ

• Must buy a DAQ that costs around $1000

• Total price: ~$1300• Resolution of 3mm• Cheaper, but less resolution

Keyence IL-100• Has an option to have an

RS-232 adapter, eliminating the need for a DAQ

• Total price: ~$1789• Resolution of 0.004 mm• More expensive, but much

better resolution

Summary

ProductsProduct Name Tolerances Range Interfaces Price

SICK DT10 3 mm to 5 mm 50 to 500 mm Analog current $389

Keyence IL-100 0.004 mm 75 to 130 mm RS-232 $1789

SICK OD2 0.075 mm 100 to 400 mm Analog current $1000

Product Name Tolerances & Resolution

Dimensions Interfaces Price

Inventables Pressure-Sensing Sheet

5 to 25%, 20g to 10 kg

Customizable, 8” by 8” preferred

Analog resistance

$133.25

Tekscan 3200 Unspecified,0 to 100 psi

6.6” by 6.6” Pressure distribution map software included

$15,000… too expensive!

Sensible UI Unspecified,4.5mm spatial resolution

7.87” by 7.4” USB $399

Distance Sensors

Pressure Sensors

Recommended choices

• Displacement sensor: SICK DT10, $389. Reasons:– Reasonable resolution (3 mm)– Interfaces with DAQ via wires and analog current– DAQ can be used with other sensors

• Pressure sensor: SensibleUI, $399. However, currently sold out and need to wait to order.

• Reasons:– Other sensors are >$5k or are not interfacable/don’t

show a pressure distribution

Other goals

• Order the pressure sensor• Create a contour plot of force generated from

the pressure sensor• Actuate the mechanical system and control it

via LabVIEW• Create publication

Questions?