Helmhotz

AD-A286 081

ARMY RESEARCH LABORATORY

The Calculation and
Measurement of Helmholtz Coil
Fields
by David J. DeTroye and
Ronald J. Chase
November 1994

ARL-TN-35

DTIC
SELECTE•
NONV 1 4 1994

F
• 94-34824

DT-IC qCx.L-2=

Approved for public release; distribution unlimited.

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The findings in this report are not to be construed as an officialDepartment of
the Army position unless so designated by other authorized documents.
Citation of manufacturer's or trade names does not constitute an official
endorsement or approval of the use thereof.
Destroy this report when it is no longer needed. Do not return it to the
originator.

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2ý REPORT DATE

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INovember

3 REPORT TYPE ANDDATES COVERED

Final. 0()tober 1109 i-(

1994

4 TITU AND SUWUM

tolber 19(44

5 FUNDING NUMERS

The Call, uL11tio1 and MAea%urenlent ot Helmnholtz (oil Field'.

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OAGMUZATION %AMS AMD ADORE SSESI

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REPORT PRJUER

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SUPPLEMENTARY NOITES

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STATEMENT

12b DISTRIBUTION CODE

Approv.ed tor puhli( release;distribution unlimited,

13 ABSTRACT

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Helmholtz (coils are used to develop unitorm magnetic tields tor a variety of research applications. Helmholtz coils can be easily constructed, and the fields easily calculated. This makes them
especially useful in calibrating sensors and numerous other low frequency magnetic field testing
applications. This particular report willdiscuss the calculation and measurement of Helmholtz coil
fields to be used for testing of composite materials to low frequency magnetic fields.

14 SUBJECT TERMS

15. NUMBER OF PAGES

21

Testing, Helmholtz coils, composite, magnetic field
17 SECURIT CLASSIFICATION
OF REPORT

Ln( lassified
NSFN 40 01 28l0 W
7
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Is. SECURITY CLASSIFICATION
OF ThIS PAGE

Unclassified16. PRICE CODE
I9. SECURITY CLASSIFICAT1ON
OF ABSTRACT

Unclassified

20. LIMITATION OF ABSTRACT

UL
Standard Fomn 298 (Rev 2-89)
Ple-bed tY ANSISid Z39 18
298 102

Contents
Page
1. Backgrou

.......................................................................................................................

5

..................................................................................................................

5

3. Test Configuration .........................................................................................................

5

4. M easurem ent Loop Calibration ...................................................................................

7

5. Helm holtz Coil Predicted Results................................................................................

8

2. Introduct

6. M easured Results ...........................................................................................................

12

7. Conclusions .........................................................................................................................

17

Distrib u tion...