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Table of contents

  1. Introduction
  2. Description
  3. Example



Here we summarize the formats and the appropriate rules related to the Standard Manodet Data Format for Data Exchange. The measured and/or calculated data will be provided here, at the web sites of the project, in this format. It can be used in the case of UNIX, as well as MS-DOS based operating systems. There are some strict rules (for example: the floating point type number format) that must be always satisfied, however, the user can find many ways to extend the data file structure in order to better meet the actual requirements. The aim of the standardization is to make the collaboration more easier. The collaborators of the project are kindly requested to send their suggestions (and questions) to:

Alessandro Formisano:
Antal Gasparics:


General overview
The names of the files have to meet the requirements of the old MS-DOS conventions (8+3 characters, without special characters).

The file is a ZIP-compressed archive, that contains the followings related to the measurement or calculation:

NAME.PS PostScript file - General description of the measurement or the calculation
NAMExxxx.GEO Data file - The description of the geometric parameters to be identified
NAMExxxx.RAW Data file - The "raw" output of the measurement
NAMExxxx.FLD Data file - The calculated values of the measured magnetic fields
NAMExxxx.MSH Data file - The apllied mesh for FEM calculation
The data files are TEXT type, while the general overview about the investigated problem can be found in non-modifyable PostScript file.

When the ZIP file includes the set of different measurements, the "xxxx" means the serial number of each measurement otherwise "xxxx" equals to "0000".

Each data file consists of at least three comment lines started with a "%" symbol. The first and the second line of the file contains the brief description and the file name, while the last line is the mark of the end of the file.

% Test file for standardizing exchange data: 
% test0000.raw
% end of file
The format of the floating point type numbers is defined strictly. The string of the number consists of the following fields:
- 1.00000 e + 01
  1. Sign (is always appeared: + or -)
  2. Mantissa (is 8 characters long - to the fifth decimal places)
  3. "e" symbol (for the separation of the mantissa end the exponent)
  4. The sign of the exponent (is always appeared: + or -)
  5. Exponent (is always 2 characters long - starts with 0 if it is lower than 10)

Zero means: +0.00000e+00

The numbers are separated by single space (" ") character in case of an array or matrix.
-1.00000e+01 -1.00000e+01 -1.00000e+01
General description (NAME.PS)
The general description can be found in "ready to print" type, non-modifyable PostScript file. This file contains all the necessary information (data and figures) about the examined specimen, measurement and their environment.

The file consist of the following fields:

Header (Information about the related files and the authors)

File name:
Example test case for defining the Data Interchange Format
Related Files:
03/11/98 10.58
Corresponding person:
A. Formisano (
Description of the measurement (Probe and Specimen)
Description of the specimen to be tested:
Square plate (8 cm. X 8 cm X 0.125 cm) of INCONEL (sigma=1e5; mu=mu0) – see fig. 3
Description of the probe:
Single pancake exciting coil with FLUXSET probe at the center (see fig. 1)
Description of the exciting system see fig. 1:
Pancake coil parallel to the plate, 1.5 mm lift off,
4.8 mm inner diameter, 10 mm outer diameter, 5.5 mm length, 93 turns of wire with 0.3 mm diameter.
Exciting current: 100 mA, frequency: 10 kHz, 20kHz
Description of the sensor:
Fluxset #6/6 see fig. 2
The sensor is located between the bottom of the exciting coil and the surface of the plate. The lift off of the sensor core (0.75 mm) is then ½ of the lift off of  the exciting coil.
Measured quantity:
X and Y component of flux density (Real part and Im. coeff).
Measurement points (in mm, referred to the PLATE CENTER):
Grid of 50X50 points with spacing 0.5 mm along x and y axis.
Description of the crack(s) (to be detected or identified)
Crack type:
Rectangular thin cracks (about 0.2 mm thick and 9 mm long), surface or hidden, located in a region 2x2 mm around the plate centre, along its “x-axis”.
15%ID, 10%ID, 15%OD, 10%OD.
15% depth = 0.1875 mm
10% depth = 0.125 mm.
Crack Parameters to be identified:
x and y position of the centre (real); crack length (real); orientation (binary: x=0, y=1); depth (%) OD/ID (binary,1=OD)
Number of different cracks considered in the data base:
1  (This line should contain the number of cases analyzed: for each case there are one geo, one fld and enevtually one raw file, with raw measurements data; each case correspond to the three files testNNNN.fld, geo and raw, where NNNN is the identifying number of the case)
Parameters Range:
xc-yc: [-1,1]x[-1,1]
len: [0,0.01]
orient.: (0 or 1)
depth: [0% 100%]
ID/OD (0 or 1)
Layout of the measurement system (Geometry, figures)
Example: (not complete - watch it in the full example)
Other information (Other necessary information)
If it is available and necessary...
Geometric parameters (NAMExxxx.GEO)
The parameters to be identified can be found the NAMExxxx.GEO file. This file contains crack parameters which are in the centre of our interest. This file includes the comment line about the brief description of the parameters (name and unit) and the data line.
% Test file for standardizing exchange data: 
% test0000.geo
% Geodata [mm]  pos_x  pos_y length orientation (1=x) depth%  ID/OD (1=OD)
 +1.00000e+01 +1.00000e+01 +1.00000e+01 0 20 0
% end of file
Raw output data (NAMExxxx.RAW)
The NAMExxxx.RAW file contains the measured values of the output signal ("raw" output) of the whole measurement system are recorded during the scanning. The relationship between the output signal and the detected magnetic field is not utilized in this case so the RAW data file can be useful for calibration or checking the any kind of distortion of the measurement technique.

This file consist of the described header and comment line after that about the brief description of the recorded physical quantities. After that each data line consist of the array of data which belongs to the same  location (position, and measured values).

% Test file for standardizing exchange data: 
% test0000.raw
% Number of measurement points:
% Raw meas. data for the test case - measures related to f1=10KHz f2=20KHz
% Pos_x_probe[mm] Pos_y_probe[mm]  Vx1_R[V] Vx2_R[V]
-1.00000e+01 -1.00000e+01 -1.00000e+01 -1.00000e+01
-1.00000e+01 -1.00000e+01 -1.00000e+01 -1.00000e+01
-1.00000e+01 -1.00000e+01 -1.00000e+01 -1.00000e+01
-1.00000e+01 -1.00000e+01 -1.00000e+01 -1.00000e+01
% end of file
Measured magnetic field (NAMExxxx.FLD)
The information about the detected magnetic field can be found in NAMExxxx.FLD named file. The structure of this file is the same as that of the file NAMExxxx.RAW, but the recorded values are transformed into magnetic field values by the utilization of the system calibration results.
% Test file for standardizing exchange data: 
% test0000.raw
% Number of measurement points:
% Raw meas. data for the test case - measures related to f1=10KHz f2=20KHz
% Pos_x_probe[mm] Pos_y_probe[mm]  Bx1_R[T] Bx2_R[T]
-1.00000e+01 -1.00000e+01 -1.00000e+01 -1.00000e+01
-1.00000e+01 -1.00000e+01 -1.00000e+01 -1.00000e+01
-1.00000e+01 -1.00000e+01 -1.00000e+01 -1.00000e+01
-1.00000e+01 -1.00000e+01 -1.00000e+01 -1.00000e+01
% end of file
The applied mesh (NAMExxxx.MSH)
The definition about the applied mesh of the FEM calculation can be found in NAMExxxx.MSH named file. This file is in "PATRAN" neutral format.


The example ZIP archive, which can be downloaded, includes TEST.PS, TEST0000.GEO, TEST0000.RAW and TEST0000.FLD files. It could be useful to download and investigate these in order to make the understanding easy. This example was prepared by Alessandro Formisano.

TEST.ZIP (21 kBytes)

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