MEEN 260
Introduction to Engineering Experimentation
Homework 7: Sensor Specifications
Assigned:
Thursday, 5 Mar. 2009
Due:
Thursday, 26 Mar. 2008, 5:00pm
Homework Problems:
Problem 1)
A Thermister is designed to operate between 200C and 200C. Assuming R
min
=3
Ω
,
R
max
=100
Ω
, and a linear relationship between resistance and temperature, and the
resistance measurement is 50
Ω
. What temperature is it?
Problem 2)
Sensor Cost: Flowmeters
a)
Go to
www.omega.com
and list 5 different types of flow meters (e.g. ultrasonic)
b)
Find a turbine flow meter made of stainless steel that can handle up to 500 gpm.
What is
the part number and price?
c)
Find the least expensive turbine (liquid) flow meter with electronic output that has an
approximate range of 0.15 gpm.
What is the part number and price?
How much
pressure can it tolerate?
What is the accuracy?
Problem 3)
Sensor Range: Accelerometers and Shock Testing
Figure 2 illustrates the use of a hammertype shocktesting device used to study the effects of
head injury resulting from an impact.
Assume that the device has a 12 kg mass attached to the
end of a 1.0 meter arm.
Assume that we wish to impart an impulse of
s
N
F
⋅
=
25
ˆ
to the test
object. Determine the angle
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 Fall '08
 LANGARI
 Fluid Dynamics, Engineering Experimentation Homework

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