07_TSC_Laser_Doppler_Vibrometers_Technical_Specs_FY23.pdf

Engineering Geology and Geophysics (85-832000) VibroFlex Qtec Laser Doppler Vibrometers

Brand/Model Specs

The Bureau of Reclamation (Reclamation) has a requirement to procure two (2) Laser Doppler Vibrometry (LDV) sensing systems, required peripherals, and data acquisition and post-processing software that could be extremely useful for rapid and comprehensive concrete structure condition assessments, damage/deterioration and void detection and mapping across large and vertical concrete structures. One particular system (Polytec Vibroflex Qtec system configured with VFX-F-110 Front-End hardware and the VFX-I-160 sensor head) is capable of long-range (300m+) offsets from the target surface with market-leading sensitivity and data quality at these far offsets, making this a practical solution for vibrational (seismic) data collection on large distant structures without the need for physical access by field crew or sensor contact to the target surface.

This ability to remotely collect broad-band (DC to 50 kilohertz) vibrational data has several implications for improving and extending current instrumentation practices and can overcome several challenges faced with sensor placements. For example, LDV can be used to remotely monitor hydropower generator components that are in line-of-sight but perhaps have a variety of conditional challenges to physical access and sensor installation (e.g., small physical access spaces, high surface temperatures, or strong electrical/magnetic fields that pose threat of flash arcs or damage to contact sensors).

Furthermore, in many situations, vibrational data can be collected during normal operating conditions.

Lastly, two of these systems are required in order to use them in a time-synchronized fashion to collect two-point measurements simultaneously which will enable 1-D/2-D/3-D/4-D seismic velocity imaging via surface wave analysis (active and passive seismic interferometry).

Long-Range High-sensitivity and dynamic range LDV system:

BRAND/MODEL:

Polytec Inc., VibroFlex Qtec VFX-I-160 Laser Doppler Vibrometers

MECHANICAL:

• Tripod-mounted LDV sensors

• Manually aimed via tripod course/fine adjustments

• A tripod-mountable pan/tilt positioner must be provided with fine adjustment via x,y micrometers

• IP40 rated (dust and condensation protection)

• Operating temperature: +5 °C … +40 °C (41 °F ... 104 °F)

• Operating max relative humidity: 80%, non-condensing

• Separate 4-channel data acquisition unit (VibroLink Digital Data Interface) that interfaces the

LDV sensors to an external data logger/laptop (separate electronics for sensor and front end).

This design makes the sensor more compact, lightweight, and free of electronic crosstalk.

Additionally, it allows for a truly non-contact approach to changing the settings.

SYSTEM OPERATION CHARACTERISTICS:

• Patented multiple-detector technology (QTec) provides stabilized digital demodulation and zero dropouts. This results in faster measurement times and the cleanest possible data that is essential for further analysis.

• Single-point sensors with heterodyne multi-path interferometer utilizing reception diversity.

• Upgradeability: System can be seamlessly upgraded to increase its frequency and velocity limits.

• Features a live video channel fully integrated into the optical head using the same front lens as the measurement laser (coaxial) with a central reticle precisely aligned with the measurement laser. This video image is used for focusing the measurement laser onto the target and the reticle is used for aligning it precisely onto the area of interest on the structure being measured.

• Operating range: must exceed 300m.

• Dynamic frequency range: DC to 25KHz

• Upgradeability: System can be seamlessly upgraded to increase its frequency and velocity limits.

• Velocity Sensitivity Range: 12 m/s particle velocity upper limit

• Measurement laser: invisible (IR), wavelength 1550 nm, output power <10 mW and targeting laser: visible (green), wavelength 520 ± 10 nm, effect. output power < 1 mW. Class 2 laser with both lasers in operation

• Each LDV sensor has a seismic accelerometer reference sensor

• Laser Beam focusing: Selectable auto focus , remote focus, and manual focus modes

• BNC input ports for use with external trigger inputs for establishing a time-zero fiducial for active seismic surveys

• Two selectable high pass and two low pass output filters must be included.

• Digital data acquisition and remote-control options. This feature makes it easy to either use pure digital data stream (via VibroLink) or access the settings via a web browser.

• 4 Channel data acquisition system for simultaneous time synced data acquisition using two LDV sensors and seismic accelerometer reference sensors simultaneously

POWER SUPPLY:

• System powered by 120v/240v AV, or 12v DC external power supplies

SYSTEM CALIBRATION:

• System and sensors come fully calibrated by manufacturer

• Warranty can be extended if calibration is maintained

SYSTEM DATA COLLECTION AND PROCESSING SOFTWARE:

• The software package is NOT optional, and is needed for both data collection and post-processing

• Data processing is performed using VibroSoft Pro which comes with VibroSoft VL VIB-W-001 Data management system (DMS) with integrated BNC connectors or Data Logger with:

o operating system Microsoft Windows 10 1607 64-bit or higher o 1 free PCIe x4 Generation 1 slots for the data acquisition board o For option VIB-S-SIG: 2 additional free PCIe x4 Generation 1 slots o 1 free USB 2.0 A slot for software protection dongle o 1 free USB 3.0 A slot for optional live video input (e. g. for VibroFlex Compact or

VibroOne with integrated camera) o RJ45 Ethernet or USB 2.0 A port for remote control of used laser vibrometer o BNC cables (included)

• Basic Software Maintenance comes with license

• Polytec math library for post-processing, and a scripting engine for individual post-processing and control

• Sample excitation via internal signal generator

• Phase compensation between LDV and reference channel(s) for synchronous measurement analysis

• Post processing in either time domain or frequency domain

• Display of displacement, velocity and acceleration and real-time integration and differentiation

(s, v, a)

2-YEAR LIMITED WARRENTY:

• The Limited Hardware Warranty Period for Polytec Covered Goods is two years after the date of the shipment thereof to the customer. Replacement parts or components that are repaired are warranted only for the remaining time of the original Warranty Period. The 2-year limited warranty excludes laser components (the “Covered Goods”).

• Laser components (such as optics and crystals) are warranted only for a period of 90 days from the date of shipment to the customer. This Limited Hardware Warranty does not apply to light sources and equipment which Polytec purchases from a manufacturer, which are not Covered Goods, and such light sources and equipment are limited to the warranty provided by the manufacturer. Polytec may in the future revoke, rescind, amend, modify, or change this Limited Hardware Warranty at any time and from time to time, but only with prospective effect.

• Limited Hardware Warranty can be extended to 7 years

AFTER SALES SUPPORT:

• Vendor must be a fully established subsidiary of the manufacturer with sales, service, and applications support offices locally in the U.S. (as opposed to a distributor)

• Can extend warranty up to 7 years by keeping calibration up to date.

• Resources to provide all servicing, support, repairs, and re-calibrations by US citizens at the customer’s facility

• The above services must be provided directly by the manufacturer

• Vendor must have laboratories that are compliant to the requirements of ISO/IEC 17025