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IEC TR 62781:2012

(Main)

Ultrasonics - Conditioning of water for ultrasonic measurements

Ultrasonics - Conditioning of water for ultrasonic measurements

IEC/TR 62781:2012(E), which is a technical report, is applicable to all measurements of ultrasonic fields where water is the transmission medium. Water provides an inexpensive and readily available medium with characteristic acoustic impedance comparable to biological tissue. However, basic tap water is far from optimum for ultrasonic measurement as it contains many dissolved, absorbed and suspended contaminants. Measurements can be affected in many ways by these impurities. This technical aims to provide a unified source to establish a water treatment process for ultrasonic measurements. The quality and treatment methods for water used within a radiation force balance (RFB) may be different from that required for hydrophone based acoustic measurements. Chemical based methods of water treatment (e.g. algaecides) may be appropriate for these applications. However, in this document, chemical means are noted but appropriately discouraged for acoustic pressure/intensity measurements. This Technical Report describes methods for:
- degassing water to be used in ultrasonic measurements;
- to decrease the ionic content of water to be used in ultrasonic measurements;
- to decrease the biological content of water to be used in ultrasonic measurements; and
- to reduce the suspended particulate content of water to be used in ultrasonic measurements.

General Information

Status
Published
Publication Date
17-Sep-2012
ICS
01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
17.140.50 - Electroacoustics
Technical Committee
TC 87 - Ultrasonics
Drafting Committee
WG 8 - TC 87/WG 8
Current Stage
PPUB - Publication issued
Start Date
15-Dec-2012
Completion Date
18-Sep-2012
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IEC TR 62781:2012 - Ultrasonics - Conditioning of water for ultrasonic measurementsIEC TR 62781:2012 - Ultrasonics - Conditioning of water for ultrasonic measurements
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IEC TR 62781:2012 - Ultrasonics - Conditioning of water for ultrasonic measurements
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IEC/TR 62781
®

Edition 1.0 2012-09
TECHNICAL
REPORT

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inside


Ultrasonics – Conditioning of water for ultrasonic measurements


IEC/TR 62781:2012(E)

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Copyright © 2012 IEC, Geneva, Switzerland

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IEC/TR 62781

®


Edition 1.0 2012-09




TECHNICAL



REPORT








colour

inside










Ultrasonics – Conditioning of water for ultrasonic measurements




























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---------------------- Page: 3 ----------------------
– 2 – TR 62781 © IEC:2012(E)
CONTENTS

FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Dissolved gases . 7
3.1 General . 7
3.2 Chemical methods . 8
3.2.1 General . 8
3.2.2 Addition of sodium sulphite . 8
3.3 Physical methods . 9
3.3.1 General . 9
3.3.2 Vacuum degassing . 9
3.3.3 Reduced pressure recirculation . 9
3.3.4 Degassing contactors . 11
3.3.5 Boiling . 11
3.4 Verification methods .
...

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