Far-Infrared and terahertz (THz) light is the spectral region between the end of the infrared region and microwave region. It is also known as sub-millimeter wave spectral region. In the last few years, there has been an explosion of interest in THz light applications as it can penetrate many materials like x-rays. THz light is now used in material science research, security, pharmaceutical compound analysis, biomedical imaging, superconducting material research, astronomy and particle physics research.

Sciencetech is a pioneer in THz spectroscopy having supplied its SPS-200 Far Infrared FTIR for over 10 years to the sub-millimeter wave research communities in astronomy and particle physics. Sciencetech has recently upgraded its SPS-200 into a truly commercial grade SPS-300 THz spectral analyzer and spectrometer thanks to the support of the European Space Agency which is using the SPS-300 for its Herschel-Plank Mission to analyze the origins of the universe.

Model SPS-300 Far-Infrared THz FTIR
The SPS-300 is Sciencetech’s latest modular polarizing Fourier Transform Spectrometer (FTS) designed specifically to operate in the far infrared or THz spectral region. While standard FTS and FTIRs are based on the Michelson configuration, the SPS-300 is based on the Martin-Puplett configuration which utilizes polarization division for a significantly increased signal to noise ratio to measure normal transmission, circular dichroism, and linear dichroism. The SPS-300 can be configured as a THz light source spectral analyzer by mating an external bolometer detector to its output port, or it can be configured into a THz materials spectrometer by mating an external light source to its input port and a sample chamber with detector to its output port.

Model SPS-200 Far-Infrared FTIR
The Model SPS-200 is Sciencetech’s older generation THz polarizing Fourier Transform Spectrometer (FTS). Although no longer available, there are many new upgrade accessories available for customers with existing systems. For example, the Rapid Scan Mode upgrade, which is also available for the SPS-300, a new highly stable mercury arc lamp, a new slower chopper system, etc.

THz Scanning Services
Sciencetech provides THz spectral analysis and scanning services on various materials in solid, liquid and gas form. Both transmission and reflectance measurements can be taken in the spectral range 20μm to 3.3mm. Please contact the Special Development Group for details.

Accessories and Upgrades

SPS-300

参考信息：

9月25日消息，据国外媒体报道，有史以来第一次，宽波长范围的THz波成功被太赫兹辐射探测器精确测量。这项技术成果来自于德国Physikalisch-Technische Bundesanstalt (PTB)和德国的国家计量研究所。

    太赫兹技术能将机场和客运站的安全检查变得更轻松更彻底。但是，太赫兹的精确测量是难题所在。以后对身体有害的射线检查可能被放弃。

太赫兹的波长范围为30微米到3000微米，频率范围为0.1THz到10THz，能穿透衣服和其它有机物质，还可以提供安全相关物质的光谱信息，如炸药等物质。这么宽的频谱范围导致了很多可能的应用诸如电子封装环节的时间和空间检查等功能。

    完整的太赫兹光谱信息必须被探测器响应。到目前为止，THz能被响应，但光谱信息却丢失了。PTB在空腔辐射器（cavity radiators）的帮助下成功首次实现光谱响应，波长范围从50微米到600微米.

    先测量太赫兹的辐射通量，再根据普朗克辐射定律进行计算，PTB使用了两个空腔辐射器在不同的温度下连接THz波段的通长波滤波器（THz band and longwave-pass filters）。辐射器内部表面涂了已知的高太赫兹辐射范围的材料，增加了探测器所接收的辐射的强度。为了获得足够的辐射纯度的太赫兹辐射，抑制超过9个数量级的红外辐射是必要的。

    通过使用红外光谱仪，通过滤波器系统的波长范围为0.8微米到1700微米。根据已知的辐射器射线量和滤波器透过量，可以精确计算出光谱通量，进而计算出太赫兹接收器精确的光谱响应。因此未来PTB将使用这种太赫兹接收器计量材料的特性，并探讨太赫兹辐射对细胞生命周期的影响。