Polytec OFV-511 User Manual

Fiber-optic vibrometer sensor head
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Title
User Manual
Fiber-optic Vibrometer
Sensor Head
O F V- 5 1 1 / 5 1 2

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Summary of Contents for Polytec OFV-511

  • Page 1 Title User Manual Fiber-optic Vibrometer Sensor Head O F V- 5 1 1 / 5 1 2...
  • Page 2: Warranty And Service

    Warranty and Service The warranty for this equipment complies with the regulations in our general terms and conditions in their respective valid version. This is conditional on the equipment being used as it is intended and as described in this manual.
  • Page 3: Table Of Contents

    2 First Steps 2.1 Unpacking and Inspection ....................2-1 2.2 Operating and Maintenance Requirements ................. 2-2 2.3 Control Elements ........................ 2-3 2.3.1 Sensor Head OFV-511 ....................2-3 2.3.2 Sensor Head OFV-512 ....................2-5 2.4 Installation .......................... 2-7 3 Optimal Stand-off Distance 4 Operating the Sensor Head 4.1 Switching On and Off ......................
  • Page 4 Contents...
  • Page 5: Safety Information

    The optical output of the laser is less than 1 mW for the sensor head • OFV-511 providing the equipment is used in the manner for which it was intended. This means that the vibrometer conforms with laser class II and is generally very safe.
  • Page 6: Laser Warning Labels

    1.1. Label 2, 3 and 4 are affixed or enclosed in the language of the customer’s country. Laser class 2 for OFV-511 Laser class 3R for OFV-512 Figure 1.1: Laser warning labels for the sensor heads in EC countries...
  • Page 7 1.2. For the sensor head OFV-511, label 3 is affixed inside. For the sensor head OFV-512, label 4 is affixed inside. Label 3 is enclosed with the sensor head as it is not possible to affix it on the mini sensor due to its size.
  • Page 8: Non-Ec Countries

    1.2.2 Non-EC Countries Warning The laser warning labels for the sensor heads in non-EC countries are shown labels figure 1.3. Laser class II for OFV-511 Laser class IIIa for OFV-512 Figure 1.3: Laser warning labels for the sensor heads in non-EC countries...
  • Page 9 1 Safety Information Position The position of the laser warning labels in non-EC countries on the sensor head is shown in figure 1.4. Label 4 is affixed inside. Label 3 is enclosed with the sensor head as it is not possible to affix it on the mini sensor due to its size.
  • Page 10 1 Safety Information...
  • Page 11: First Steps

    3. In the case of a wrong delivery, damage or missing parts, inform your local Polytec representative immediately and give them the serial number of the sensor head. The identification label can be found on the back of the sensor head and also on the inside cover of this manual.
  • Page 12: Operating And Maintenance Requirements

    2 First Steps 2.2 Operating and Maintenance Requirements Operating The sensor head can be operated in dry rooms under normal climate environment conditions (refer to specifications in chapter 6). In particular the optical components in the sensor head are sensitive to moisture, high temperatures, jolting and dirt.
  • Page 13: Control Elements

    2 First Steps 2.3 Control Elements 2.3.1 Sensor Head OFV-511 Front panel The front panel of the sensor head OFV-511 is shown in figure 2.1. S I G N A L O . V - 5 1 1 . I B E R I N T E R . E R O M E T E R...
  • Page 14 Each mini sensor is exactly adjusted to its fiber. Never exchange the mini sensor with a mini sensor of another sensor head ! Back panel The back panel of the sensor head OFV-511 is shown in figure 2.2. A C H T U N G !
  • Page 15: Sensor Head Ofv-512

    2 First Steps 2.3.2 Sensor Head OFV-512 Front panel The front panel of the sensor head OFV-512 is shown in figure 2.3. S I G N A L O . V - 5 1 2 . I B E R I N T E R . E R O M E T E R L A S E R S T A N D B Y Figure 2.3: Front view of the sensor head OFV-512...
  • Page 16 2 First Steps Mini sensors (diameter 10 mm) Each mini sensor contains a lens to focus the laser beam. The mini sensor of the reference fiber is marked with a red dot. Exchange of the mini sensors with fiber heads is described in section A.1.
  • Page 17: Installation

    2 First Steps 2.4 Installation For the installation of the sensor head, proceed as follows: Preparing 1. Only OFV-512: Unscrew the mini sensor from the reference fiber. The reference fiber is marked with a red dot. Mount the reference head OFV-151 on the reference fiber as described in section 4.6.
  • Page 18 2 First Steps...
  • Page 19: Optimal Stand-Off Distance

    3 Optimal Stand-off Distance 3 Optimal Stand-off Distance OFV-511 The stand-off distance is measured from the shoulder of the connector for the mini sensor or the fiber head. The optimal stand-off distances are: n l ⋅ Optimal stand-off distance 135mm l = 204 mm ±...
  • Page 20 3 Optimal Stand-off Distance...
  • Page 21: Operating The Sensor Head

    4 Operating the Sensor Head 4 Operating the Sensor Head 4.1 Switching On and Off The vibrometer is switched on by using the key switch on the front panel of the controller. To do so, turn the key switch to position I.The L POWER above the key switch then lights up and shows that the controller is ready to operate.
  • Page 22: Optimizing The Focus Of The Laser Beam

    4 Operating the Sensor Head 4.5 Optimizing the Focus of the Laser Beam The signal level display helps you to optimize the focus of the laser beam. The signal level is shown on the front of the sensor head as a 10-part bar display.
  • Page 23: Activating Transport Safety Mechanism

    4 Operating the Sensor Head 4.8 Activating Transport Safety Mechanism Caution ! Always activate the transport safety mechanism before moving the sensor head ! If the sensor head is being transported, the shock absorbing feet of the housing do not provide sufficient protection. For this reason, the interferometer must additionally be secured with a transport safety mechanism.
  • Page 24 4 Operating the Sensor Head...
  • Page 25: Fault Diagnosis

    Please use the corresponding checklist in the user manual of the controller, when you consult Polytec or your nearest representative. 5.1 No Laser Beam If no laser beam is emitted, please check the following: 1.
  • Page 26: No Measurement Signal

    5 Fault Diagnosis 5.2 No Measurement Signal If the laser beam is emitted but there is no measurement signal, check the signal level display. To do so, proceed as follows: 1. Put a piece of reflective film at an optimal stand-off distance according to the information given in chapter 3 in the beam path.
  • Page 27: Technical Specifications

    Laser type: helium neon Wavelength: 633 nm 204 mm ± 1 mm Cavity length: OFV-511 Laser safety class: 2 (in non-EC countries: II) Laser output power: < 1 mW Length of fiber cable: 2 000 mm (3 000 mm for option OFV-C-11)
  • Page 28: Optics

    Maxima of visibility 135 mm + (n · l) mm, n = 0; 1; 2; ..., l = 204 ± 1 mm OFV-511 OFV-512 0 mm + (n · l) mm, n = 0; 1; 2; ..., l = 204 ± 1 mm...
  • Page 29: Dimensions

    6 Technical Specifications 6.4 Dimensions Fiber Heads OFV-102 Length: 57 mm Diameter: 20 mm Diameter of the focusing ring: 24 mm OFV-130-3, OFV-130-5 Length: ca. 105 mm Diameter: 20 mm Diameter of the focusing ring: 24 mm Side Exit Heads OFV-C-102 2 5 7 .
  • Page 30: Table Of The Maxima Of Visibility

    C o u n t e r s i n k f o r M 6 - D I N 9 1 2 Figure 6.3: Reference head OFV-153 6.5 Table of the Maxima of Visibility Sensor Head OFV-511 Maxima of visibility (in mm) for l = 204 mm 1 767...
  • Page 31 6 Technical Specifications Sensor Head OFV-512 Maxima of visibility (in mm) for l = 204 mm 1 632 3 264 4 896 6 528 8 160 1 836 3 468 5 100 6 732 8 364 2 040 3 672 5 304 6 936 8 568...
  • Page 32 6 Technical Specifications...
  • Page 33: Appendix A: Optional Accessories For The Sensor Head

    A Optional Accessories for the Sensor Head Appendix A: Optional Accessories for the Sensor Head A.1 Fiber Heads Overview The following fiber heads are available for the sensor head OFV-511/-512: OFV-102 standard fiber head • OFV-130-3 for beam diameter 3 µm •...
  • Page 34 A Optional Accessories for the Sensor Head Assembly For mounting the reference head OFV-153, you proceed as follows: 1. Make sure that the beam shutter on the sensor head is closed. 2. Unscrew the mini sensor or the fiber head from the connector of the measurement fiber.
  • Page 35 A Optional Accessories for the Sensor Head Adjust the To correctly adjust the laser beam, you proceed as follows: laser beam Move the slider 1 of the reference head OFV-153 in figure A.3 to its starting position at 0 mm. Figure A.3: Adjusting the laser beam in the reference head OFV-153 7.
  • Page 36 A Optional Accessories for the Sensor Head Adjust the To correctly adjust the stand-off distance, you proceed as follows: stand-off 1. Measure the distance from the connector for the mini sensor or fiber head distance to the object under investigation. 2.
  • Page 37 The side exit heads have a mirror and a side exit window. The laser beam can thus be deflected by 90 degrees from the output direction from the fiber. The following side exit heads are available for the sensor head OFV-511/-512: OFV-C-102, 90° steering head, diameter 5 mm •...
  • Page 38 The flexible arm OFV-039 is a mount device for the mini sensor of the sensor head OFV-511/-512. The mini sensor can thus be easily positioned in places which are difficult to access. The heavy steel base ensures that it stands...
  • Page 39 A Optional Accessories for the Sensor Head Technical Specifications Weight (incl. base plate): 3.2 kg Height: max. 400 mm Base plate dimensions: refer to figure A.6 2 x 4 5 ° 0 . 5 0 C o u n t e r s i n k i n g D I N 7 4 K m 6 ( 3 x ) A - A Figure A.6: Base plate for the flexible arm OFV-039 (dimensions not specified are given...
  • Page 40 A Optional Accessories for the Sensor Head...
  • Page 41: Appendix B: Basics Of The Measurement Procedure

    B Basics of the Measurement Procedure Appendix B: Basics of the Measurement Procedure B.1 Theory of Interferometric Velocity and Displacement Measurement Optical interference can be observed when two coherent light beams are made to coincide. The resulting intensity e.g. on a photo detector varies with the phase difference ∆ϕ...
  • Page 42 B S 3 D e t e c t o r Figure B.1: Optical configuration of the interferometer in the sensor head OFV-511 The light source is a helium neon laser which provides a linear polarized beam. The polarizing beam splitter BS1 splits the beam into the object beam and the reference beam.
  • Page 43 Figure B.2: Optical configuration of the interferometer in the sensor head OFV-512 In contrast to the OFV-511, the beam is coupled out of the reference arm as well as the object arm here. As the resulting signal only depends on the path difference, this allows optical generation of a true difference signal.
  • Page 44 B Basics of the Measurement Procedure...
  • Page 45 OFV-511 OFV-512 connecting cables, protect connector SIGNAL PROCESSOR OFV-511 OFV-512 accessory, optional control elements fiber heads back panel OFV-511 flexible arm OFV-039 back panel OFV-512 reference head OFV-153 front panel OFV-511 side exit heads front panel OFV-512 acclimatization period cooling...
  • Page 46 OFV-511 LASER key control elements OFV-512 OFV-511 front view OFV-512 sensor head OFV-511 LASER ON LED sensor head OFV-512...
  • Page 47 OFV-512 missing parts reference beam multimode laser basics of measurement procedure optical configuration, sensor head OFV-511 optical configuration, sensor head OFV-512 no laser beam, fault diagnosis reference heads no measurement signal, fault diagnosis adjusting laser beam for OFV-153...
  • Page 48 OFV-511 applied table for OFV-512 (differential laser safety measurements) STANDBY LED table for OFV-512 (single point OFV-511 measurements) OFV-512 visibility, minimum of...
  • Page 49 E-mail: info@polytec.de E-mail: info-vi@polytec.de Internet: http://www.polytec.de Internet: http://www.polytec.com POLYTEC GmbH France (F) Büro Berlin Polytec PI / RMP S.A. Schwarzschildstraße 1 32, rue Délizy D-12489 Berlin F-93694 Pantin Cédex Tel.: (030) 6392-5140 Tel.: (+33) 1-4810 39 30 Fax: (030) 6392-5141...

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Ofv-512

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