Pressure-sensitive paint measurement on co-rotating disks in a hard disk drive

Tomohiro Kameya*, Yu Matsuda, Hiroki Yamaguchi, Yasuhiro Egami, Tomohide Niimi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


There is much demand for improvement in the performance of a hard disk drive (HDD) along with recent rapid developments of information technology. While high-speed disk rotation of a HDD is necessary to accommodate such needs, it causes disk flutter induced by pressure fluctuation on disks and degrades reliability of a HDD. In order to understand the mechanism of the fluttering phenomenon, it is important to know pressure field on the rotating disk. However, it is impossible to measure the pressure by ordinary methods such as pressure taps. Pressure-sensitive paint (PSP) is a pressure measurement technique based on the oxygen quenching of luminescence and enables us to measure the pressure non-invasively. In general, however, the temperature sensitivity of PSP makes it difficult to measure the precise pressure on the surface with temperature distribution. We measured the time-averaged pressure on the disk rotating at 10 00020 000 rpm for the first time by adopting a temperature-insensitive PSP composed of pyrene sulfonic acid (PySO3H) as a luminophore. It was found that the pressure forms a concentric circular distribution and decreases toward the center of the disk. Additionally, we elucidate how disk rotational speed and spacing between co-rotating disks influence on the pressure field.

Original languageEnglish
Pages (from-to)82-86
Number of pages5
JournalOptics and Lasers in Engineering
Issue number1
Publication statusPublished - 2012 Jan
Externally publishedYes


  • Hard disk drive
  • Pressure-sensitive paint
  • Rotating disk surface

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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