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Measurement of Fluid Pressure01:16

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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
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Invar-based refractometer for pressure assessments.

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    Gas modulation refractometry (GAMOR) offers improved precision for pressure measurements using Invar, a non-conventional material. This demonstrates GAMOR

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    Area of Science:

    • Metrology
    • Optical Physics
    • Materials Science

    Background:

    • Refractometry is sensitive to environmental fluctuations and material drifts.
    • Conventional cavity spacers limit precision and material choices.
    • Gas modulation refractometry (GAMOR) offers a method to mitigate these issues.

    Purpose of the Study:

    • To evaluate the performance of a dual-cavity refractometer using Invar as a cavity spacer material.
    • To compare the precision of an Invar-based system with a Zerodur-based system for pressure assessment.
    • To demonstrate the viability of non-conventional materials in GAMOR systems.

    Main Methods:

    • Implementation of a dual-cavity refractometer system.
    • Utilizing Invar as the primary cavity spacer material.
    • Conducting empty cavity measurements and Allan deviation analysis for nitrogen gas.

    Main Results:

    • The Invar-based system exhibited superior precision for pressure assessment compared to a Zerodur system.
    • White noise response for nitrogen was measured at 3 mPa s1/2 over 104 s.
    • Minimum Allan deviation of 0.34 mPa (0.08 ppm) and 24-hour stability of 0.7 mPa were achieved.

    Conclusions:

    • The GAMOR methodology enables the use of alternative, non-conventional cavity spacer materials like Invar.
    • Invar-based refractometers can achieve high precision and stability in pressure measurements.
    • This advancement broadens the scope of materials applicable in high-precision optical measurements.