| Autor: |
Vasseghi, Koorosh, Yue, Kintak, Blanco, Julio R. |
| Předmět: |
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| Zdroj: |
Review of Scientific Instruments; Dec1990, Vol. 61 Issue 12, p3716, 3p |
| Abstrakt: |
A simple differential integrator circuit is described for use with a Kepco OPS 1000B high-voltage power supply. The circuit maintains a constant phototube output dc current as incident light changes intensity during a spectroscopic measurement. The dc level is maintained better than ± 50 μV. The response time constant of the circuit is 1.6 ms, thus attenuating noise components as high as 0.6 kHz. However, the circuit is insensitive to the high-frequency signal components (50 and 100 kHz) normally measured in phase modulated spectroscopic ellipsometry. This circuit design can be used as explained with most phototubes without any changes. The high-voltage bias is easily computer controlled. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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