Scanning Laser Doppler Vibrometer

Scanning laser Doppler vibrometry is a full-field vibration imaging measurement technique in which the vibrometer measurement beam scans the test object and records the vibration data of a grid of measurement points within a short time.

The Optomet Scanning Laser Doppler Vibrometer (SLDV) combines the superior signal quality of the NOVA SWIR digital vibrometers with beam deflection mirrors, a HD video camera, an integrated signal generator and inputs for reference channels. With the OptoSCAN software, the scanning laser vibrometer becomes a turn-key and intuitively operated vibration visualization system.  In conjunction with the OptoGUI software, the SLDV can be operated as a single-point vibrometer.

The non-contact vibration measurement of any test structure provides precise and valuable insight into the structure’s dynamic behavior.  Operating and structural vibrations can be animated, resonances identified, finite element model calculations validated, or the energy propagation of surface waves made visible.

Infrared Laser Scanning Vibrometer
Scanning Laser Vibrometer
Laser Vibrometer close-up unit
Vibration measurement scanning surface
Vibration measurement scanning surface

State-of-the-art scanning laser vibrometry

Optomet pioneered the world’s first short-wave infrared (SWIR) laser-based Scanning Laser Doppler Vibrometer which eliminates the need for surface treatment and produces the highest quality data through superior measurement sensitivity.

Maximum sensitivity due to the largest optical aperture

The Optomet Scanning Laser Doppler Vibrometer has the industry’s largest optical aperture, maximizing the collection of reflected laser light.  This ensures the highest possible measurement sensitivity even at points with minimal laser backscattering.

Measurements on any surface

By combining the ultra-high sensitivity of the Optomet Scanning Laser Doppler Vibrometer with the superior signal quality of the SWIR laser technology, even surfaces with minimal optical reflectivity and at the greatest measurement distances can be accurately measured.  Test objects with varying surface reflectivity and complex geometries are measured by the Optomet Scanning Laser Doppler Vibrometer in one measurement process, without the measurement surface having to be prepared with reflective film.

User-friendly measurement software

The OptoSCAN scanning laser vibrometer software is the industry’s most user friendly and modern user interface which enables even inexperienced users to efficiently obtain precise measurement data.  For details see SOFTWARE / OptoSCAN.

Features of the Optomet vibrometers

Features common to all Optomet SWIR Digital Laser Doppler Vibrometers include ultraDSP universal digital signal processing, real portability, intuitive hardware and state of the art software are described in more detail in the product-overview.

 

Characteristics - Scan Laser Vibrometer

  • Compact, truly portable and intuitive Handling
  • SWIR laser source and large aperture with best optical sensibility
  • Open data and control interfaces
  • Vibrational velocities up to ±25 m/s
  • Displacement resolutions down to 50 Femtometers
  • End-to-end digital workflow
  • 3 analog outputs with a sample rate of 160 Msamples/s
  • GBit Ethernet Digital Output
  • Remote update und upgrade via Ethernet

Technical Specifications

A detailed list of all vibrometer characteristics, including all hardware and software features, can be found in the vibrometer data sheet in Support & Datasheets.

Technical data

Category Characteristics
Measured quantity Velocity, Displacement, Acceleration
Signal processing Digital (OptoMET UltraDSP)
Frequency bandwidth DC up to 10 MHz
Maximum velocity 25 m/s
Working distance Up to 100 m
Scan angle (h x v) 50 ° x 40 °
Camera Full HD 1080p, 30x optical zoom
Ethernet Digital Output 1 GBit/s
BNC analog Outputs Displacement, velocity, acceleration, signal-generator outputs
BNC analog inputs Measurement input, 2 x reference inputs
  24-bit A/D converter per channel
  Support for IEPE (Integrated Electronic Piezoelectric) inputs
Laser wavelength Measurement laser: output power: 1550 nm, <10 mW, eye-safe, class 1
  Targeting laser: 510-530 nm
Laser safety class Measurement laser: output power <10 mW, eye-safe, class 1
  Targeting laser: output power: <1 mW, eye-safe, class 2
Operating temperature range +5 ... 40°C
Dimensions Length x width x height (excluding handle): 450 x 224 x 180 mm
Weight 12kg
Power supply 110 -240V AC (50-60Hz) oder 12 V DC

Laser Vibrometer Measuring- & Data Acquisition Software

Our Scanning Laser Vibrometer can either be used in scanning operation mode using the OptoSCAN software but also in single-point operation mode using the OptoGUI Software to manage the vibrometer settings, start the measurement, and perform the data analysis. Both operation modes and programs can even be used simultaneously.  

OptoGUI Software

OptoGUI is an extensive and intuitive software for remote control, data acquisition, and data analysis when working in single-point mode. Data transfer is realized via a loss-free digital Gigabit Ethernet connection. Click for detailed information about OptoGUI.

OptoSCAN

OptoSCAN is an extensive and intuitive software for remote control, data acquisition, and data analysis when working in scanning mode. Data transfer is realized via a loss-free digital Gigabit Ethernet connection. Click for detailed information about OptoSCAN.

Available decoders

A wide variety of high-performance real-time decoders are available for the evaluation of the interferometric measuring signals. The OptoMET UltraDSP technology enables the measurement of frequencies up to 24 MHz (for Single-Point Operation Mode) and vibrational velocities up to 25 m/s, displacements can be resolved to less than 100 fm. All vibrometers incorporate a velocity decoder. Displacement and acceleration decoders are optionally available. Numerous measuring ranges per decoder ensure that measurements can always be performed with the optimum sensitivity.

Decoders can be easily retrofitted or upgraded. Start with a basic system and adapt the capabilities of the measuring instrument as required later on. This requires no return of the instrument to the factory and no waiting times for your production or research project. The table below provides an overview of the configuration options. We will also be happy to assist you in the selection of the best decoder for your measuring task.

Description

Decoder Name

Number of measuring ranges

Max. vibrational velocity

Max. Frequency (Scan-Mode)

 Comments 

 

Basis

Velocity Decoder D-VD-1N

8

5 m/s

80 kHz

Required

 

 

Displacement Decoder D-DD-1N

19

 

 

Optional

 

 

Acceleration Decoder D-AD-1N

8

 

 

Optional

 

Sense

Velocity Decoder D-VD-2N-12

12

12 m/s

1 MHz

Required

 

 

Displacement Decoder D-DD-2N-12

19

 

 

Optional

 

 

Acceleration Decoder D-AD-2N-12

12

 

 

Optional

 

High Speed

Velocity Decoder D-VD-3N

11

25 m/s

2.5 MHz

Required

 

 

Displacement Decoder D-DD-3N

19

 

 

Optional

 

 

Acceleration Decoder D-AD-3N

11

 

 

Optional

 

High Frequency

Velocity Decoder D-VD-4N

9

12 m/s

10 MHz

Required

 

 

Displacement Decoder D-DD-4N

19

 

 

Optional

 

 

Acceleration Decoder D-AD-4N

9

 

 

Optional

 

Master

Velocity Decoder D-VD-5N

14

25 m/s

10 MHz

Required

 

 

Displacement Decoder D-DD-5N

19

 

 

Optional

 

 

Acceleration Decoder D-AD-5N

14

 

 

Optional

 

 

 

Accessories

Scanning Vibrometer Transport Case

Scanning Vibrometer Transport Case

Stable and waterproof Peli case for safe keeping and transport of vibrometer

External dimension (L x B x H): 62,5 x 49 x 35 cm 

Scanning Vibrometer Close-Up Unit

Close-up Unit

For measurements at the shortest distances of a few mm and less.

Infrared Light Detection Card

Detector Card

Transforming the not-visible infrared light into a spot of visible light.

Laser Vibrometer Infrared Camera

IR-Camera

For digital visualizing of the laser point. The camera can be easily mounted on the gauge rail at the top of the vibrometer.

Laser Vibrometer Tripod with Fluid Head

Tripod with fluid head

Precisely align your vibrometer with high quality tripods by Manfrotto

Mobile Battery for Laser Vibrometers

Mobile Battery

Portable battery charger, external battery power bank. For powering the vibrometer when performing outdoor measurements.

Protection window

Protects the scanning mechanism against dust, wind and acoustic excitation at high sound pressure levels. Specially coated optical-grade glass window to avoid laser distortions. 

Rough rotating grinding wheel

Local defect resonance detection on a CFRP plate

Example applications – Laser Scanning Vibrometer

Vibration animation of a sports-car door

Vibration animation of a metal bar

Sound Field of an Acoustic Levitator

Researching defects in a CFRP plate

Vibration mode of a Printed Circuit Board (PCB)

Vibrations of a rough rotating grinding wheel

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