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Terahertz NDT

What is Terahertz (THz)?

Features of Precision Terahertz Measurement

Features of Precision Terahertz Measurement

Terahertz radiation is part of the electromagnetic spectrum lying between microwaves and the far-IR. This region has frequencies ranging from 0.1 – 10 THz and wavelengths from 3 mm to 0.03 mm. This spectral region is often referred to as the “Terahertz gap” as these frequencies fall between electronic (measurement of field with antennas) and optical (measurement of power with optical detectors) means of generation.


Recent advances in combining optical and electronic methods have allowed for generation and detection of very high signal-to-noise ratio and high data acquisition rates of 0.1 – 3 THz frequencies.

Features of Precision Terahertz Measurement

Features of Precision Terahertz Measurement

Features of Precision Terahertz Measurement

  • Short terahertz pulse is an electromagnetic analog to ultrasound. 
  • Terahertz pulses penetrate most non-conductive materials. 
  • Completely safe, low power thermal energy. 
  • Easy waveform analysis for measurement customization.
  • Handheld tools are available for single point or line scan. 

Applications of Terahertz Measurement

Features of Precision Terahertz Measurement

Applications of Terahertz Measurement

  • Coating Thickness. 
  • Aircraft NDT. 
  • FRP Composite NDT. 
  • Pipeline Repair Inspection. 
  • Seam Evaluation. 
  • Ceramic Coating Thickness. 
  • Void Detection. 
  • Radome Inspection. 
  • Automotive Fuel Tanks.


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Terahertz Gauging for Process Control


TeraMetrix

Terahertz Control Unit T-Ray 5000

T-Ray 5000 SPG Single Point Gauge

T-Ray 5000 SPG Single Point Gauge

The T-Ray® 5000 is the first compact pulsed terahertz measurement system that is robust enough to be deployed in an industrial environment and has all of the flexibility provided by our fibre coupled sensor heads in a rack mount package. 


By having replaceable sensor heads, the T-Ray® 5000 can be configured to fit your specific application.

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T-Ray 5000 SPG Single Point Gauge

T-Ray 5000 SPG Single Point Gauge

T-Ray 5000 SPG Single Point Gauge

If your application calls for handheld coating measurement, or defect detection, the SPG500 provides an easy to use tool for coatings down to 25 microns and can display up to 3 selected measurements on the screen at the pull of a trigger. The T-Ray 5000 SPG is a single point thickness measurement gauges allows direct measurement of multiple layer objects with just the press of a button.


The SPG can switch between a Right Angle or "Straight-On" Sensor Head configuration. 

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T-Ray 5000 LSG Line Scan Gauge

T-Ray 5000 SPG Single Point Gauge

T-Ray 5000 LSG Line Scan Gauge

The Line Scan Gauge (LSG) expands the function of hand held scanning by casting the beam along a 2-3 inch line, providing a real-time cross-sectional image (B-Scan) of the object under test.  Each waveform can be analysed to provide individual layer measurements, b-scan images or videos. 


Applications include void detection, subsurface defects or inclusions, aerospace/automotive final assembly procedures e.g. measurement of "step and gap" between coated panels.

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Online Sensor Head (CID1)

Luna’s TeraMetrix THz equipment used to examine Da Vinci’s "Last Supper"

T-Ray 5000 LSG Line Scan Gauge

The Online Sensor Head enhances the robustness of the T-Ray 5000 by enabling opertaion in flammable atmospheres, such as paint booths or coating facilties.  The sensor is designed to be robot mountable and intrinsically safe. The working distance of the sensor head is fixed as standard at 115mm, but other working distances can be configured by request. 


The CID1 is ideal for industrial and pilot applications where the transceiver is to be deployed in an explosive environment (paint booths, chemical plants etc). 

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Luna’s TeraMetrix THz equipment used to examine Da Vinci’s "Last Supper"

Luna’s TeraMetrix THz equipment used to examine Da Vinci’s "Last Supper"

Luna’s TeraMetrix THz equipment used to examine Da Vinci’s "Last Supper"

In 2019 at the  Museo del Cenacolo Vinciano (Milan, Italy), Polo Museale Regionale della Lombardia, Ministero per i beni e la attività culturali  and the Istituto Centrale per il Restauro (Rome, Italy), requested that the Last Supper by Leonardo Da Vinci, was examined using terahertz (THz) and millimeter waves.




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