Inductively Coupled Resonant Humidity Monitoring Exploiting Irreversible State Changes (eBook)

Sebastian Sauer (Autor)

eBook Download: PDF

2016 | 1. Auflage
204 Seiten
Books on Demand (Verlag)
978-3-7431-6868-8 (ISBN)

Infos

Due to the pervasive nature of water, water vapor, and moisture, there is a strong influence on the product quality of a multitude of goods (e.g., food, chemicals, electronics, ammunition, etc.). Humidity as environmental water vapor is therefore of strong interest for the purposes of measurement and control throughout the life cycle of goods not only in regard to their use but also during manufacture, transport, and storage. One of the key requirements of monitoring measurement systems is to determine critical threshold or accumulated dosage exposure conditions. Nowadays, RFID technology is established, and a large number of standardized and non-standardized solutions of differing complexity exist. Sensor-enhanced RFID tags not only provide unique identification information but also additional sensor information. Fulfilling a monitoring task on item level is challenging when there is no continuous supply of electric energy available, a common application constraint in sensor-enhanced RFID applications. Application constraints are impeded due to the low cost requirements on the RFID market. Wireless passive humidity monitoring sensor solutions, in which the exceedance of a humidity threshold leads to a permanent, preferably irreversible change of a sensor parameter are proposed in this study. In the presented solutions, this is either a lasting electric resistance (IREV-R sensor approach) or an electric capacitance change (IREV-C sensor approach). For this purpose a number of physico-chemical phenomena are technically exploited in different sensor arrangements. These are the deliquescence of salts as threshold detection mechanism, transport processes in porous media as well as chemical liquid phase sintering of metal nanoparticles. The sensor principles introduced effectively act as humidity threshold-activated relative humidity dosimeters. For use in combination with RFID tags single use, low-cost sensor solutions are favored. Inkjet print as a representative mass production technique for printed electronics is examined in more depth, and its application exemplified for the IREV-R sensor principle. Theoretical, numerical and laboratory experimental results, which demonstrate the feasibility of the proposed sensor principles and developed solutions, are presented.

Sebastian Sauer received his Dr.-Ing. and Dipl.-Ing. degree in Mechatronics in 2009 from the Technische Universität Dresden (TUD). He is working as a scientific assistant at the Institute of Semiconductors and Microsystems of the TUD, and holds a position in industry at company PRODAT. His general interest covers sensors, passive wireless sensors, sensor systems, wireless sensor networks, and the technical exploitation of irreversible state changes.

Inhalt

Title Page 3
Copyright 4
Table of Contents 5
Nomenclature 7
1 Introduction 17
1.1 Towards Completely Printed Sensor-enhanced RFID Tags 17
1.2 Humidity Impact and Promises of Lowest Cost Monitoring Solutions 18
2 State of the Art 21
2.1 Humidity Measurement Principles and Sensors 21
2.2 Wireless Passive Sensors 28
2.3 Sensors Exploiting Irreversibility 32
3 Thesis Scope and Structure 41
4 Physicochemical Phenomena Exploited 43
4.1 Humidity Threshold Detection and Sensor Activation by Deliquescence 43
4.1.1 Deliquescence and Efflorescence 44
4.1.2 Influential Factors 48
4.2 Dissemination Processes in Porous Media as Delay and/or State Change Mechanism 52
4.2.1 Porous Media and the Representative Elementary Volume 52
4.2.2 Transport Processes in Porous Media 53
4.2.3 Salt Solution Dissemination 57
4.3 Nanoparticle Sintering as a Permanent State Change Mechanism 58
4.3.1 Nanoparticles and Nanoparticle Inks 58
4.3.2 Nanoparticle Sintering 62
4.3.3 Exploited Chemical Sintering 65
4.4 Discussion 70
5 Sensor Resonator and Measurement System 73
5.1 Sensor Resonator 74
5.2 Measurement Procedure 86
5.2.1 Principle 86
5.2.2 Mutual Inductance and Coupling Coefficient 88
5.2.3 Steady State in the Frequency Domain 91
5.2.4 Transient State in the Time Domain 97
5.3 Double Planar Coil Sensor Arrangement 104
5.4 Time Domain Sensor Interrogation 111
5.4.1 An Interrogation System Architecture 111
5.4.2 Signal Analysis Problem Formulation 112
5.4.3 Analysis Algorithm Performance Comparison . 117
5.4.4 Matrix Pencil Technique 121
6 Irreversible Capacitance Change Based Wireless Sensor Principle 127
6.1 Concept 127
6.2 Elementary Capacitive Cell 129
6.3 Measurement Setup 132
6.4 Experimental Results 134
6.5 Discussion 138
7 Sensor Principle Based on an Irreversible Resistance Change 141
7.1 Concept 141
7.2 Manufacturing via Inkjet Print 142
7.2.1 Humidity Sensitive Element 144
7.2.2 Critical Manufacturing Parameters 147
7.2.3 ICR Resonator Printing 154
7.3 Humidity Response 155
7.4 Variation of Selected Sensor Parameters 160
7.5 Intermixed Salt-Nanoparticle Region 163
7.6 Complementary Results 168
7.7 Application Demonstration 175
7.7.1 Inductively Coupled Resonant Sensor Tag 175
7.7.2 Sensor-enhanced RFID UHF Transponder Tag 177
8 Conclusion and Outlook 181
Bibliography 185
List of Figures 201
List of Tables 205

Produkt-Details

• Erscheint lt. Verlag: 26.10.2016
• Sprache: englisch
• Themenwelt: Technik ► Elektrotechnik / Energietechnik
• ISBN-10: 3-7431-6868-5 / 3743168685
• ISBN-13: 978-3-7431-6868-8 / 9783743168688