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Spectral Radar OCT Imaging System
商品货号:ECS000374
商品品牌:Thorlabs
PDF 文档: DownloadSpectral Radar OCT Imaging Systemdetails Document
详细介绍

Thorlabs' SR-OCT Imaging System Features

  • Real-time In-situ Imaging of Biological and Industrial Samples
  • Integrated Michelson Interferometer in Probe Minimizes Mode Dispersion
  • Telecentric Optics Provide Perpendicular Beam Over Broad Scan Range Minimizing Image Distortion
  • Application Specific Resolution: Standard, Deep Imaging, or Enhanced Resolution
  • Handheld Probe or Microscope Options (microscope available upon request, please contact info@thorlabs-hl.de)

Optical Coherence Tomography (SR-OCT) Imaging System

Thorlabs' Spectral Radar Optical Coherence Tomography (SR-OCT) systems are based on Fourier (frequency) domain technology which provides micron-level imaging of turbid media.  FD-OCT is a frequency-domain technique which offers several advantages over time-domain techniques due to the higher sensitivity that enables a significant increase in speed while maintaining high image quality. The resultant speed enhancement allows for rapid cross-sectional image collection, enabling facile imaging of larger sample volumes in real-time.  The Spectral Radar OCT is ideal for real-time imaging in clinical, surgical, industrial and material science applications.  Please visit our new Image Gallery for up-to-date application information including Human Cochlear Imaging and Ventilated Mouse Lung Imaging

This system was developed in collaboration with Thorlabs (USA), and two German-based organizations: Thorlabs Lübeck AG and the Medical Laser Center Lübeck. This system combines a broadband light source with a high-speed spectrometer to perform Fourier domain detection of the OCT interference fringe signals.

System Description

Thorlabs’ Spectral Radar OCT Systems include a broadband super-luminescent diode (SLD) located in the base unit, which is fiber coupled to a Michelson interferometer. The interference signal, from the sample and reference arm reflections, is coupled back into the same fiber and is redirected by the fiber optic coupler to a high-speed spectrometer. The spectrometer uses a high-speed linear sensor array and supports a high spectral resolution (0.06 to 14nm, model dependent). The analog and digital timing circuitry and all drive electronics are integrated in the base unit which is isolated both optically and electronically to ensure stable performance of the high-speed spectrometer. The analog interference fringe signal from the spectrometer is digitized by the data acquisition card installed in the computer, and the integrated software package provides complete control of measurement, data acquisition, and processing.  The system can be installed and operational within minutes.

The Spectral Radar OCT System is now available with two imaging options: a microscope design (available upon request) or the standard handheld probe. Both systems have an integrated CCD camera and provide high resolution 2D imaging. In addition, the microscope version also provides 3D imaging capabilities

Handheld Probe Version (OCP930SR, OCP840SR, OCP900SR)

  • Integrated Michelson Interferometer in Probe Minimizes Mode Dispersion
  • Telecentric Optics Provide Constant Illumination Spot Size Over a Broad Range of Working Distances
  • 2D OCT Images up to 8 frames/second
  • Real-time In-situ Imaging of Biological and Industrial Samples

Microscope Version (Available Upon Request)

Thorlabs’ Spectral Radar OCT now offers a microscope version for 3D imaging capability. The microscope includes X- and Y- scanning mirrors for 2D scanning of sample surfaces. When combined with the depth profiling capability of OCT, 3D structures of the sample can be measured with high resolution in minutes. The microscope also has a built-in CCD camera to provide surface viewing of the sample which is convenient for real-time imaging of the samples.

  • X- and Y- Scanning Mirrors
  • 2D, Depth Profiling and 3D Imaging
  • Stage Provides 2D Sample Translation (X, Y) and Rotation

Effect of Wavelength on Imaging Applications

The selection of a particular OCT system depends on the specific application requirements. Image quality depends both on the type of sample, as well as the design of the system. For example, water is more transparent to light in the 600 to 800nm wavelength range. Since the outer portion of the eye (cornea, vitreous, and lens) is mostly water, OCT imaging at 800nm has become the industry standard in many ophthalmic applications. For multilayered biological tissue (skin, brain, GI tract, etc.), the 900 to 1400nm range is appropriate, since longer wavelengths typically provide better penetration depth.

Choice of Axial Resolution to Match Your Application Requirements

Aside from wavelength, one of the more significant parameters for choosing an OCT system is the resolution requirements for a given application. In general, the resolution is determined by the spectral bandwidth of the light source. The broader the spectral bandwidth, the better the resulting axial (longitudinal) resolution of the image (see spec tab).

The Standard (930nm) SR-OCT has a 100nm spectral bandwidth, which yields a typical imaging depth of ~1.6mm and an axial resolution of 6.2μm. Overall, this multi-purpose system provides a balanced optimization of both resolution and measurement depth. To accommodate special imaging requirements, Thorlabs now offers two additional SR-OCT systems: the Enhanced Resolution and the Deep Imaging Models.

The Enhanced Resolution (900nm) model provides superior resolution at the surface when compared with either the Standard (930nm) or Deep Imaging (840nm) system. Due to its axial resolution of 4.5μm, this system is ideal for creating high-resolution images near the surface. For example, this system can be used to identify cancer cell boundaries during surgical procedures. However, the image quality will degrade more quickly with depth than it would with the other two models.

The Deep Imaging (840nm) Spectral Radar System’s prime advantage is its ability to provide a larger imaging depth (3.2mm) than any of the other spectral radar systems, with an axial resolution of 15μm.

All Three Models of our SR-OCT Imaging Systems include:

  • OCT Base Unit with Spectrometer
  • PC, Monitor and Imaging Software
  • Handheld Probe with Interferometer
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