Far-Infrared THz FTIR

Main Features: 
  • Modular design for use as far-infrared/THz spectral analyzer or materials spectrometer.
  • Dual polarizing Martin-Puplett and Michelson interferometer configurations depending on beam splitter used
  • Industry’s finest 4µm Mylar grid beam splitter for Polarizing Mode
  • Supports external third party light sources and detectors
  • Supports external custom designed sample chambers
  • Standard precision step scan and rapid scan modes
  • Standard CW source operation, Pulsed source optional.
  • Large 90mm gold coated optics
  • Wide 3-2000cm-1 (5µm-3.3mm) spectral range
  • 0.119cm-1 resolution for standard model with 50mm stage
  • 0.02cm-1 for high resolution model with 300mm stage upgrade
  • Vacuum sealed housing supporting pressures up to 10-3 Torr to eliminate spectral effects of atmospheric water vapor.

For some information about latest measurements made by renowed world scientists in TeraHertz sciences click:  http://www.kbfi.ee/thz/?p=spssoftware

SPS-300 System The base system of the SPS-300 includes: SPS-300 Body consisting of:

  • Servo motor chopper
  • 75W ultra quiet Hg arc lamp source
  • Motorized roof mirror alignment system
  • Mylar beam splitter for Michelson operation mode
  • Grid polarizer for polarizing Martin-Puplett mode
  • Steel or optional stainless steel casing
  • External water cooling recirculator
  • External 75W Hg arc lamp power supply and igniter
  • External servo motor electronics for choppers and translation stage
  • External stepper motor electronics for roof mirror alignment
  • Host PC with SPS control software

Additional requirements for Spectral Analyzer configuration:

     Detector and light input port with flipping mirror

Additional requirements for Materials Spectrometer configuration:

     Sample chamber and detector 


SKU: SPS-300

Sciencetech’s SPS-300 is a modular polarizing Fourier Transform Interferometer (FTS or FTIR) designed specifically to operate in the far-infrared and THz spectral region (5μm-5mm or frequency between 0.1-15 THz or in the band of 3-500cm-1). The modularity of the SPS-300 allows it to be configured as a far-infrared/THz light source spectral analyzer or as a materials transmission and reflectance spectrometer. The SPS-300 has large 90mm optics and can be operated in both classical Michelson mode with an aluminized Mylar beam splitter, and in Martin-Puplett Mode with a 5" diameter grid polarizer beam splitter that provides the broadest possible spectral range and makes the SPS-300 truly unique. The Polarizing mode also has other advantages in spectroscopy, biophysics, surface science, electrochemistry, material science, and infrared ellipsometry. For more information download the full FTIR brochure below.

Technical Specifications

Spectral Range: 2-2000cm-1 (5µm-5mm)

Standard Resolution: 0.119cm-1 with 5cm translation stage

High Resolution: 0.020cm-1 with 30cm translation stage

Signal-to-Noise Ratio: varies with the source and detector selected, but with a standard Sciencetech detector and the built-in source, typical values are as follows:

                              in Michelson mode: 0.4%

                              in Martin-Puplett mode: 2.2%

Optics: Martin-Puplett optical configuration,  large 90mm optics, fast f/2.35 off-axis paraboloid condensers for high light throughput

Grid Polarizer Beam Splitter: 2μm lines with 4μm pitch aluminum on Mylar substrate

Body: vacuum steel housing capable of maintaining 10-3Torr

Source: internal 75W Hg arc lamp (water cooled) with external DC stabilized power supply and igniter

Controls: motorized roof mirror alignment (tilt, rotary shear, lateral shear) to fine tune interference at the beam splitter

Ports: vacuum purge port, thermocouple vacuum gauge with analog dial display, inlet and outlet ports for water cooling of internal light source and stepper motors

Scan: Step and Scan Mode (standard): detector data collection is synchronized with the translating roof mirror positioning. The mirror is moved to selected positions and readings are taken.

         Rapid Scan Mode: the roof mirror moves continuously and does not stop as detector collects data.

Dimensions: 99 x 63 x 3cm (39”x 25”x15”)

Weight: steel body: 180kg (397lb)

            stainless steel body 80kg (176lb).

 

          Pulsed Source operation
 
The SPS300 Pulsed mode upgrade allows the user operate with pulsed sources. In pulsed mode the mirror positioning and detector sampling are synchronized with pulses from the source. For pulse repetition rates greater than a couple of kHz the source can be considered as effectively continuous - i.e. normal CW operation can be used. However for lower rates synchronization prevents degradation of S:N due to sampling effects. The upgrade includes a TTL input for electrical synchronizing pulses.
 
Note that low pulse repetition rates require correspondingly long measurement times, as only a single step can be measured for each pulse.
 
Using the SPS-300, and either the standard  bolometer  we supply having NEP ~1.E-13 or the DTGS detector having NEP ~7.E-11, and considering   1nJ pulses, we estimate single pulse S/N ratios as follows :  (not considering system losses)
 
   Pulse rate:    10/s         1/s
   Bolometer   30000:1   10000:1
   DTGS           40:1       15:1
 
If source stability is poorer than the detector noise levels the pulse noise will dominate,  but by using a second reference detector the S/N ratio in the interferogram can be improved toward the limit set by detector noise.
 
Price: $143,610.00
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