Measurement of shadow mask vibration and Q value using two position-sensitive detectors

Measurement of shadow mask vibration and Q value using two position-sensitive detectors

A noncontact optical system that can measure both the vibration characteristics of the shadow mask and the relative distance (Q value) between the shadow mask and the phosphor surface of the glass panel of a cathode ray tube (CRT) is developed. Two position-sensitive detectors (PSDs) were employed t...

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Veröffentlicht in:Review of scientific instruments 2002-01, Vol.73 (1), p.216-220
Hauptverfasser: Bae, Jong Han, Kim, Jung-Ki, Kang, Sung Gu, Nam, Eun Hee, Kwon, Jin Hyuk, Jeong, Tae Young, Shin, Ki Mog
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container_end_page 220
container_issue 1
container_start_page 216
container_title Review of scientific instruments
container_volume 73
creator Bae, Jong Han
Kim, Jung-Ki
Kang, Sung Gu
Nam, Eun Hee
Kwon, Jin Hyuk
Jeong, Tae Young
Shin, Ki Mog
description A noncontact optical system that can measure both the vibration characteristics of the shadow mask and the relative distance (Q value) between the shadow mask and the phosphor surface of the glass panel of a cathode ray tube (CRT) is developed. Two position-sensitive detectors (PSDs) were employed to detect the positions of two beams that were reflected by the shadow mask surface and the inner surface of the glass panel. The relative distance between them is critical for the performance of the CRT. The vibration signals obtained from the PSDs were displayed in both temporal domain and spectral domain by using LabView software. The resonance frequencies of 20, 75, 400, and 490 Hz were identified and the low 20 Hz component was responsible for generating discomfort to the human eye.
doi_str_mv 10.1063/1.1427414
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title Measurement of shadow mask vibration and Q value using two position-sensitive detectors
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