Non contact laser thermal expansion instrument

Thermal expansion meters are mainly divided into optical interferometry expansion meters and mechanical thermal expansion meters. Optical interferometry is an optical non-contact, absolute measurement method with high measurement accuracy. But the cost is expensive, and the instrument structure and operation are very complex. The advantages of a mechanical thermal expansion instrument are that it is easy to use, has a simple structure, and is suitable for samples of various shapes. The disadvantage is that the mechanical thermal expansion instrument is affected by impurities such as sample racks and detection rods, so it cannot avoid the influence of these impurities on the absolute accuracy and error of the calibration standard sample.

Super LIX-ROverview of non-contact laser thermal expansion system

Super LIX-RNon contact laser thermal expansion instrumentThe system is a high-sensitivity non-contact thermal expansion instrument using a dual path Michelson interferometer with a linear deflection helium neon laser. This high-precision dilatometer is based on absolute thermal expansion measurement of the displacement between the reflecting surfaces in contact with the two ends of the sample using laser wavelength.

This measurement method complies withJIS(JIS R3251-1995)The method for determining the thermal expansion coefficient of low expansion glass is suitable forUsed for thermal expansion coefficients as low as5ppb/℃(i.e5 x 10^-9/K）Measurement of zero expansion materials at the level of grade, based on analysis of actual sample test results:30℃The thermal expansion coefficients measured three times are as follows::5 x 10^-9/K,4 x 10^-9/K,4 x 10^-9/K, in10℃，20℃，30℃，40℃，50The repeatability of ℃ is better than5 x 10^-9/K. (See details)P36-41）

Features:

1）By adding anti vibration mechanisms within the system, the impact of vibration interference can be prevented, and general analysis electronic balances (resolution) can be performed in stable usage environments0.01mg）The measurement.

2）According to the laser wavelength（632.8nm）Measure the displacement of the sample. The optimization of optical components eliminates stray light and improves the signal-to-noise ratio of edge signals. Special displacement calibration does not require measurement or operation.

3）The image sensor detects interference fringes, processes the image, and calculates the expansion rate.

4)By using an insulated low-temperature thermostat to control the temperature of the sample and the surrounding area, the temperature can be controlled at every minute0.01°C.

5)The automatic sample setting fixture can achieve stable sample setting without requiring operators to undergo special training.

The sample setting of the fixture is manual.

Super LIX-Rparameter

Temperature measurement range:0~50℃(Using high-precision constant temperature circulation system)

Thermal expansion detection system:Michelson type laser interferometer

Optical path:dual optical path

Sample size:Φ 5mm or Φ 5 ± 0.5mm x length 12-20mm

Standard sample size:φ5mm xlength20mm

Both ends should be carried outSR(Spherical) treatment to prevent the top from becoming uneven.

Surface average roughness: The average roughness is better than0.8a

Measurement accuracy:CTEvalue5x10^-9/KOr lower (based on low expansion materials of standard size)

Repeatability:CTEvalue5x10^-9/KOr lower (based on low expansion materials of standard size)

Resolution:＜0.2nm

Display:Graphic intensity

Laser:Laser type:He-NeGas laser (continuous oscillation)

Power:5mW (IEC 60825-1 class 3B)

Light source wavelength:632.8nm

Thermocouple: PT-100Platinum thermocoupleJIS C 1604-1997

Test atmosphere:low pressureHe（100Pa）

Heating and cooling rate: 0.01 ℃/min~1.5 ℃/min

Recommended for high-precision testing0.1℃/min

Temperature display resolution: 0.001 ℃

Temperature measurement accuracy:Accuracy meetsJIS-Class A (±0.15°C at 0 °C)