| Autor: |
Solís-Macías, J., Sánchez-López, J. D., Castro-García, R., Flores-Camacho, J. M., Flores-Rangel, G., Jian-Jhih Ciou, Kai-Wei Chen, Chang-Hsiao Chen, Lastras-Martínez, L. F., Balderas-Navarro, R. E. |
| Předmět: |
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| Zdroj: |
Review of Scientific Instruments; Dec2017, Vol. 88 Issue 12, p1-3, 3p |
| Abstrakt: |
Photoreflectance-difference (PR/PRD) and reflectance-difference (RD) spectroscopies employ synchronic detection usually with lock-in amplifiers operating at moderate (200-1000 Hz) and high (50-100 KHz) modulation frequencies, respectively. Here, we report a measurement system for these spectroscopies based on a multichannel CCD spectrometer without a lock-in amplifier. In the proposed scheme, a typical PRD or RD spectrum consists of numerical subtractions between a thousand CCD captures recorded, while a photoelastic modulator is either operating or inhibited. This is advantageous and fits the slow response of CCD detectors to high modulation frequencies. The resulting spectra are processed with Savitzky-Golay filtering and compared well with those measured with conventional scanning systems based on lock-in amplifiers. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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