| Autor: |
Michael Bordovsky, C.N. Morgan, Ian H. White, Christine Mignosi, Nicholas A J Lieven, Roger P. Griffiths |
| Rok vydání: |
1999 |
| Předmět: |
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| Zdroj: |
Testing, Packaging, Reliability, and Applications of Semiconductor Lasers IV. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.345438 |
| Popis: |
A novel low cost, non-contact optical vibration sensor requiring only a single optoelectronic component has been developed. It consists of a CW semiconductor laser operating with external optical feedback. The laser beam reflected from a target generates a series of lasing modes set by the external cavity length. Beating of the modes produces an RF signal and this signal is detected as a variation in the junction voltage. Any change in the external cavity length induces corresponding beat frequency variations in the RF signal, which are transformed into amplitude variations using a simple edge-detection filter system. Using this sensor, low amplitude vibrations have been measured at frequencies of up to 600 Hz. Successful results have been achieved with target reflectivities lower than 5%. When calibrated, the sensor demonstrates satisfactory output for submicron vibration amplitudes. Maximum amplitudes of 1 mm have been measured with an accuracy of 0.2%. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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