Vielitzer Stra

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• Vielitzer Straße 43
• 95100 Selb
• GERMANY
• Tel. [phone]
• Fax [phone]
• Email info_at_linseis.de

Linseis Inc. 20 Washington Road P.O.Box
666 Princeton-Jct. NJ 08550 Tel. (609)
799-6282 Fax [phone] Email
info_at_linseis.com
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The Company

• Since 1957 Linseis Corporation delivers
  outstanding service, know how and leading
  innovative products in the field of thermal
  analysis and thermal physical properties. We are
  driven by innovation and customer satisfaction.
  Customer orientation, innovation, flexibility and
  last but not least highest quality are what
  Linseis stands for from the very beginning.
  Thanks to these fundamentals our company enjoys
  an exceptional reputation among the leading
  scientific and industrial companies.
• Claus Linseis
• Managing Director

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The Company
Linseis Germany Vielitzerstr. 43 95100 Selb
Linseis USA 08550 Princeton Jct. / NJ
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ASTM E 289

• This test method covers the determination of
  linear thermal expansion of rigid solids using
  either a Michelson or Fizeau interferometer.
• The precision of measurement of this absolute
  method (better than 40 nm/(mK)) is
  significantly higher than that of comparative
  methods such as push rod dilatometry (for
  example, Test Methods D 696 and E 228) and
  thermomechanical analysis (for example, Test
  Method E 831) techniques. It is applicable to
  materials having low and either positive or
  negative coefficients of expansion

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Coefficient of Expansion

• Definition of the Coefficient of Thermal
  Expansion
• (CTE) The coefficient of thermal expansion is
  generally defined as the fractional increase in
  length per unit rise in temperature. The exact
  definition varies, depending on whether it is
  specified at a precise temperature (true
  coefficient of thermal expansion) or over a
  temperature range (mean coefficient of thermal
  expansion). The former is related to the slope of
  the tangent to the length temperature plot,
  while the latter is governed by the slope of the
  chord between two points on this curve.
  Considerable variation in the value of the CTE
  can occur according to the definition employed.

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L75 LASER DILATOMETER

• Features
• Michelson Principle Laser Dilatometer
• Non contact expansion and shrinkage measurement
• No calibration needed
• Any solid sample material (reflecting not
  reflecting)
• Free choice of sample geometry
• Sample preparation same as with conventional
  Dilatometer
• Measurements under inert, oxid., red., vacuum
• Maximum precision 0,3 Nanometer
• temperature range -180 up to 1600C (different
  furnaces)
• Induction and heat resistance furnace possible

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L75 LASERThe System

• Unmatched resolution and absolute accuracy is now
  possible due to the new development of the
  Linseis Laser Dilatometer of the Pico-series.
• The system consists of three main components
• The Michelson Interferometer
• The measuring system
• The furnace

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The Michelson Interferometer
The used double plane-mirror interferometer is
used for simultaneously making pairs of
nanoprecision length measurements. The He-Ne
lasers, which is frequency stabilized on the used
model, was specifically designed for making
longer length measurements, along with
corrections for environmental shifts in laser
wavelength, thus providing the basis for the
unbeaten metric precisions.
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The Measuring System
Dilatometer of the Pico-series. As the name
indicates already the resolution goes up to
Picometers (0,3nm 300 Picometer). That means
resolutions can be obtained which are up to a
factor 33,33 higher as the resolution that were
possible up to date. On top the principle of
interference measurement give the possibility for
much higher accuracys, especially as some
special computer calibrations are used. Up to now
absolute accuracys of 1 were normal, with best
accuracys up to 100nm. The new method allows
accuracys up to 30nm.
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L75 Laser 500LT Laser Dilatometer with low
temperature furnace Temperature -150 500C
Interferometer
Furnace
Gas Control
Interferometer Electronics
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L75 Laser Laser Dilatometer with Induction
Furnace Temperature -150 1000C -150
1600C Heat up and cool down speed 100K/s
Iron Sample
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The Furnaces

• Resistance Furnace
• The system can be equipped with conventional
  resistance furnaces with a temperature range
  from
• -150 500C
• RT 1000C

• Induction Furnace
• The system can be equipped with an induction
  furnaces with a temperature range from
• -150 1000C
• -150 1600C

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Applications
Reproducibility of an INVAR Sample
An INVAR Sample was evaluated four times during
heating in an air atmosphere. The temperature
range was room temperature up to 200C. The
difference of the four measurements was as low as
0.01 FS.
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Applications
Measurement of fused silica, NIST SRM739
Soll represents the NIST value
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Applications
Measurement of sapphire, cutting angle 0 to
C-Axis
Soll represents the literature value
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Applications
Measurement of Copper, NIST SRM736
Soll represents the NIST value
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Applications
Measurement of polycrystalline Al2O3, Purity
99.7
Soll represents the literature value
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Applications

• Precision measurement of thermal expansion of low
  expansion materials such as carbon, graphite,
  composites, low expansion glass, amber alloy,
  quartz glass, etc.
• Precision measurement of thermal expansion of
  semiconductor materials.
• Quality control and quality inspection of
  materials of which thermal expansion
  characteristics can be a problem, such as glass,
  sealing materials, bimetals, materials for
  precision electronic instruments etc.