# HW5 - Texas A&amp;M University Department of Mechanical...

This preview shows pages 1–2. Sign up to view the full content.

Texas A&M University Department of Mechanical Engineering MEEN 260 Measurement and Instrumentation in Mechanical Engineering Fall 2010 Assignment #5 Due Monday, Oct 11, 2010 Problem 1: (6 Points.) An inductive sensor probe is shown below. a. What is the nominal inductance of a probe with , a circular cross section of , and a standoff distance of ? b. Assuming that we have excite the probe with a sinusoidal signal of amplitude 12 volts at 1200Hz, what are the values of for both the stanoff position as well as when the probe is at a distance of 11mm from the measured object (a rotating shaft?) The resistance of the probe is 1.2 Ohms. Problem 2: (4 Points.) A capacitive sensor is used to make position/displacement measurements. Assuming a similar configuration as that in the class notes, what is the sensitivity of the probe (in terms of changes in capacitance versus distance) at is nominal position given a nominal capacitive gap of 1mm and electrode area of ? Assume dielectric constant of air to be 1. V i L R h 0 x V o Nominal position of the top of the shaft h Top of the shaft position after displacement n 100 = 1cm 2 h 0 = V 0 2

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Solution October 18, 2010 2 Solution Problem 1: a. The nominal inductance of a probe with , a circular cross section of diameter , standoff distance of is given by (1) (2) b. The inductance of the probe when the shaft is displaced by 1mm from its nominal position is
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 01/03/2011 for the course MEEN 260 taught by Professor Langari during the Fall '08 term at Texas A&M.

### Page1 / 2

HW5 - Texas A&amp;M University Department of Mechanical...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online