The development of a new primary calibration system for laser vibrometers at INMETRO |
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| Gustavo P. Ripper, Guilherme A. Garcia, Ronaldo S. Dias |
- Abstract:
- The laser vibrometer (LV) is a powerful non-contact transducer capable of accurately measuring point motion quantities by means of interferometric techniques. According to the requirements in standard ISO/IEC 17025, measurement traceability to the International System of Units (SI) is to be established through an unbroken chain of calibrations, linking measuring and testing equipment to the national or international measurement standards. At present, standard procedures specifying how to calibrate a laser vibrometer are still an open issue. As laser vibrometers are becoming more and more a standard measurement tool for the mechanical engineer, the establishment of standards and calibration procedures becomes more urgent. Otherwise, LVs can not be used in many applications such as a reference for the calibration of accelerometers by secondary laboratories. The vibration laboratory of INMETRO has two digital laser vibrometers and is developing a new calibration system to trace them back to the Brazilian national measurement standards. Basically, two alternative methods are applicable: primary calibration by laser interferometry, and secondary calibration by comparison to a reference transducer traceable to a national standard. This paper focuses on the primary calibration of laser vibrometers against a homodyne quadrature interferometric system. The system under development may be able to calibrate LVs with both analog and digital outputs. The theory of the method is briefly described. The scheme of the new experimental setup is presented and some experimental results obtained in a preliminary implementation are given.
- Keywords:
- calibration, vibrometer, vibration, metrology
- Download:
- IMEKO-TC22-2007-105u.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC22
- Event name:
- Cultivating metrological knowledge
- Title:
- 1st Conference on Vibration Measurement (together with 20th TC3 Conference on Measurement of Force, Mass and Torque & 3rd TC16 Conference on Pressure Measurement)
- Place:
- Merida, MEXICO
- Time:
- 27 November 2007 - 01 December 2007