Chapter 9 Miscellaneous Measurements by Yixin Ma 15/05/2013 miscellaneous [,mIsa'leInias ]consisting of many different kinds of things that are not connected and do not easily form a group. 混杂的；各种各样的. 235 CONTENTS 9.1 Time,Frequency,and Phase-Angle Measurement 9.2 Liquid Level 9.3 Humidity 9.4 Chemical Composition 9.5 Current and Power Measurement 9.6 Using "Observers"to Measure Inaccessible Variables in a Physical System 9.7 Sensor Fusion(Complementary Filtering)Chapter 9 Miscellaneous Measurements by Yixin Ma 15/05/2013 miscellaneous【ˌmɪsəˈleɪniəs】: consisting of many different kinds of things that are not connected and do not easily form a group. 混杂的；各种各样的. CONTENTS 9.1 Time, Frequency, and Phase-Angle Measurement 9.2 Liquid Level 9.3 Humidity 9.4 Chemical Composition 9.5 Current and Power Measurement 9.6 Using “Observers” to Measure Inaccessible Variables in a Physical System 9.7 Sensor Fusion (Complementary Filtering) 2/35