Imaging Systems


Raster Scan Imaging System

 

Polarization RotatorThis Microtech THz imager uses a similar optical set up as the transmission spectrometer, but utilizes linear stages for holding and moving an object in the focal point of a THz beam. The central focal point ensures good resolution for hte imager and allows for a high dynamic range by focusing the whole signal through an object at a small point.

 

Key features include:

  • Can be used with both BWO and TPO sources
  • Comes with easy-to-use software
  • Ideal for non-destructive evaluation


 

T-Vision: Video Rate Imaging System

 

T-Vision imaging system is the solution for imaging applications that require high frame rates. The T-Vision system is an all-in one system, integrating our TPO generator with imaging optics. The imaging is based on a nonlinear process, where hte THz image is mixed with a near-IR pulse, generating an upconverted near-IR image that is detected with a CMOS camera. This system can be customized to suit your needs - let us know what your application requires and we will do our best to meet your specifications.

 

Download Movie: Leaf

Download Movie: Concealed Objects

Download Movie: Internal Defect in Plastic

 

THz Spectrometers


Compact THz Spectrometer:

Polarization Rotator Compact THz Spectrometers offered by Microtech Instruments, Inc. enable transmission measurements in thespectral range of 100 GHz to 1.5 THz. These systems are based on millimeter wave Backward Wave Oscillators (BWO's) combined with frequency multipliers and broadband Pyroelectric Detectors.

THz spectrometers offered by Microtech Instruments enable high-resolution spectroscopic measurements in the spectral range from 180 GHz to 1.42 THz. These systems employ frequency tunable Backward Wave Oscillators (BWOs) as sources of THz radiation and Golay Cells as detectors.

Key features include:
Spectral Range: 100 GHz - 1.5 THz
• Spectral Resolution: 1 - 10 MHz
• Dynamic Range: 10^4


Model Operating Spectral Range
TScan-260 180 - 260 GHz
TScan-370 180 - 370 GHz
TScan-1100 180 - 1100 GHz
TScan-1250 180 - 1250 GHz
TScan-1420 180 - 1420 GHz





THz Transmission Spectrometer:

Polarization Rotator Transmission measurement is the best method for characterization of highly transparent materials. In particular, transmission spectra of plane parallel plates exhibit a periodic transmission pattern caused by interference (Fabry-Perot etalon fringes). Real and imaginary parts of the dielectric constant can be determined from these measurements, as the period and amplitude of the etalon fringes depend on the material refractive index and absorption, respectively.

Characterization of semi-transparent materials requires a THz Mach-Zehnder interferometer (shown below), since no etalon fringes can be observed in the transmission spectra of such materials. The Mach-Zehnder setup enables measurements of a phase shift induced by the sample as a function of frequency. Combining this data with transmission spectrum, real and imaginary parts of the dielectric constant can be calculated.



THz Mach-Zehnder Spectrometer:

Polarization RotatorCharacterization of semi-transparent materials requires a THz Mach-Zehnder inferometer (shown below), since no etalon fringes can be observed in the transmission spectra of such materials. The Mach-Zehnder setup enables measurements of a phase shift induced by the sample as a function of frequency. Combining this data with transmission spectrum, real and imaginary parts of the dielectric constant can be calculated.

Highly absorptive materials can only be characterized in a reflection geometry, illustrated below.












THz Reflection Spectrometer:

Polarization Rotator Opaque materials characterization requires the reflection spectrometer (shown above). Because the transmitted signal is too small for characterization, a system using 6-axis control is employed to measure the reflected signal. As with the transmission and phase spectrometers the index of refraction, extinction coefficient and the real and imaginary parts of the dielectic function can be quickly calculated from the software's theoretical fitting capacity.

The transmission, Mach-Zehnder and reflection spectrometers are supported by TScan software, enabling automated data acquisition and analysis. One spectral scan takes 1 - 5 minutes for each of the BWOs employed in the system.

Detailed specifications and pricing are available on request at sales@mtinstruments.com