Comparison measurements of low-pressure between a laser refractometer and ultrasonic manometer.

نویسندگان

  • Patrick F Egan
  • Jack A Stone
  • Jacob E Ricker
  • Jay H Hendricks
چکیده

We have developed a new low-pressure sensor which is based on the measurement of (nitrogen) gas refractivity inside a Fabry-Perot cavity. We compare pressure determinations via this laser refractometer to that of well-established ultrasonic manometers throughout the range 100 Pa to 180 000 Pa. The refractometer demonstrates 10(-6) ⋅ p reproducibility for p > 100 Pa, and this precision outperforms a manometer. We also claim the refractometer has an expanded uncertainty of U(pFP) = [(2.0 mPa)(2) + (8.8 × 10(-6) ⋅ p)(2)](1/2), as realized through the properties of nitrogen gas; we argue that a transfer of the pascal to p < 1 kPa using a laser refractometer is more accurate than the current primary realization.

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عنوان ژورنال:
  • The Review of scientific instruments

دوره 87 5  شماره 

صفحات  -

تاریخ انتشار 2016