Chapter 22 homework

Question 1

1. Define Measurement

Answer 1

Procedure in which an unknown quantity is compared to a known standard l using a accepted and consistent system of units

Question 2

2. What is metrology

Answer 2

the science of meaurement

Question 3

3.7 basic quantities used in metrology upon which all variables are derivced

Answer 3

1. length
2. mass
3. time
4. electric current
5. temperature
6. luminous intensity
7. matter

Question 4

4. Difference between accuracy and precision in measurement. Define both

Answer 4

1. Accuracy is the degree to which the measured value agrees with the true value of the quantity of interest
2. Precision is a measure of repeat ability in a measurement process

Question 5

9. 2 basic components of a coordinate measurement machine

Answer 5

1. Probe head and probe to contact the work part surfaces
2. Mechanical structure that provides motion of the probe in three Cartesian axes and displacement transducers to measure coordinate value at each axis

Question 6

15. What is machine vision

Answer 6

consists if the acquisition of image data, followed by processing and interpretation of these data by computer for some industrial application

Question 7

17. 2 types of image sensors used in machine vision cameras

Answer 7

1. Charge coupled device CCD

2. Complementary metal oxide semiconductor CMOS