OCT系统创新 - 制造设计的组件规范

Ilminster, 1 December 2020

光学相干断层扫描(OCT)检查我们了解挑战。OCT系统制造商需要提供能够更高分辨率成像的系统,比以往更高的成本更高。您需要适合用于规范,预算和时间表的目的组件和系统。为了以规模实现这一目标,同时降低产品寿命的成本,需要高效且有效的系统设计。

G&H has a history of bringing instruments to life. Present day we work with OEMs across the world, advancing the state of the art in fused components and paving the future of photonic component and system development. We do this through specification, clear manufacturing pathways and a collaborative approach, enabling us to add value to OEMs from the outset.

Through investment and acquisition, we have developed our OCT manufacturing provision to become a world leader in this arena. From an initial focus on biomedical procedures such as cardiology, skin cancer investigations to ophthalmology in the 1990s, OCT is now being seriously considered for applications such as materials analysis in markets ranging from oil and gas, to food processing and automotive paint testing.

Customers’ demand for high specification yet economical components and subsystems has seen increasing development and manufacture of OCT systems by OEMs, ranging from start-ups to established multinationals.

客户总是要求定制OCT系统设计,这些设计专用于特定应用,因此需要仔细选择其组件和供应商,以最大限度地提高系统性能,同时最大限度地降低成本和开发时间。亚搏开户网址

At G&H we understand our customers’ need for high performance, as well as flexibility in design. For decades we have developed integrated subsystems, such as the critical fused fiber coupler, which was initially for the long-distance optical communications industry and is now available for OCT too. We have invested in R&D and listened to our customers’ needs, developing key components such as the optical delay line, PDR (polarization diverse receiver) and collimator for OCT interferometers, as well as subsystems and fully bespoke OCT systems.

OCT系统的发展成功并亚搏开户网址不完全依赖于选择零件的最佳组合的OEM,而是考虑到市场和开发的时间,制造成本至关重要。设计的方法可以在正确的时间和价格点到达市场的OCT项目之间的差异,或者在昂贵的细化周期中延迟。

由于我们建立的购买力和制造焦点设计,我们可以帮助客户克服这些挑战。组件选择和集成到高质量和有效的OCT子系统中的专业知识,可以在数量和最高标准中制造的,是系统创新的关键。

组件选择

当OEM正在设计OCT系统时,重要的是考虑以下关键组件和子系统的性能和可靠性,以便在装配和制造之后实现最佳总体结果:

  • optical delay line
  • PDR (polarization diverse receiver)
  • 光纤耦合器。

(1) Optical delay line

The optical delay line is a key part of any OCT system, enabling the operator to adjust optical transmission to exactly match the reference and sample arms, such as in ophthalmology, when patients’ eyes can be different sizes.

Critical aspects of the delay line to be considered when choosing this component include:

  • 环境稳定性:它可靠地执行over the desired range of operating conditions and will it reduce image fading?
  • Low loss (return loss): does it prevent formation of image artefacts while maximizing image contrast and maintaining power efficiency?
  • 它足够快吗?公平期望为50 mm / s,以实现每次测量快速优化和调整。

在开发亚搏开户网址其光学延迟线时,G&H致力于使可以在任何OEM系统中使用的组件。因此,虽然OCT设计变化,但延迟线的功能是一致的。此外,公司的延迟线在相对较高的速度下运行,这意味着运营商可以更快地优化其位置,从而改善临床或工业环境中的工作流程。

(2) PDR (polarization diverse receiver)

G&H Polarization Diverse Receiver for OCTPDR干扰了两个进入的光束,并将它们分成其正交的线性偏振状态以进行高速,极化敏感的OCT测量。根据应用区域,每个PDR都指定为在不同波长下运行:

  • 1550 nm for industrial applications
  • 1310 nm用于心脏病学和皮肤癌症应用
  • 1060 nm for ophthalmic applications

选择用于集成到OCT系统的PDR系统时,OEM应该寻找以下品质平衡检测;高CMRR(共模抑制比),其将改善图像对比度和信噪比的信号;一个相对高的带宽,实现了大的图像深度;和双重平衡检测,消除极化衰落。

根据最近的扫描激光源考虑OCT系统,这种设计支持更大的光学功率。无论应用如何,PDR都在每个波段的特征和优化。PDR设计是一个紧凑的模块,其光电二极管在一个包装中完全集成在一个包装中,使用小光电二极管在基座上。因此,所有光纤对准都已经为OEM完成 - 没有所需的进一步光学连接。

(3) Fused fiber couplers

G&H fiber couplerFused fiber couplers are widely used for branching optical signals and interfacing in telecommunications, sensor and biomedical systems, including deployment in environments requiring rigorous quality and reliability standards such as OCT systems.

该组件对高端OCT应用的适用性取决于制造和装配的一致性和可重复性,因为OEM的目标是在批量上市OCT系统。

在G&H在G&H使用单模和偏振保持纤维制造一系列可见光和NIR波长的熔融光纤耦合器。随着Wonderea电信应用的耦合器的长期历史,这些熔融纤维部亚搏开户网址件制造成严格的标准,并具有低插入损耗和高消光比。

在熔融光纤连接器中考虑的设计功能和规格是:

  • well-controlled coupling ratio for consistent unit-to-unit performance
  • a wide bandwidth/flat response allowing higher image resolution and better image contrast
  • dispersion control to enable better image resolution and minimize image artefacts.

最近由G&H开展的研究作为题为Galahad的欧盟资助项目的一部分,专注于超广邻人OCT耦合器。该研究靶向了300nm的带宽,以实现超高分辨率成像和极化敏感的OCT,用于早期检测患者青光眼。

实际光谱仪是OCT检测中的关键组件。通常需要少于0.05nm的高分辨率性能,以便在样品中的深度范围内图像的较小毫米。随着深度范围的增加,边缘的频率增加或周期变得更加紧张。因此,需要高分辨率来解决此问题并导出要生成图像的最大信息。

Environmental stability is always an important factor considering the real-world situations where the OCT system will be deployed, whether clinical or industrial. Resistance to changing thermal conditions is paramount to maintain consistent performance.

组件集成

Besides individual specifications and component interoperability, the ability to integrate components into a compact OCT module – including PDR, delay line, coupler, polarization controllers and collimator, for example – is fundamental. Minimizing secondary assembly stages, especially making fiber optic splices, will maximize device performance.

设计和工程新的组件技术和我们提供集成模块,子系统和系统的能力,增加了价值,使我们的客户能够专注于想法生成,以证明专家为专家提供照顾的知识,安全通过成本,时间和风险降低实际价值。

A more in depth discussion of the factors to consider in OCT system DFMA can be viewed in the webinar recordingOCT Systems Start to Finish。可以访问上述组件的细节OCT Components and Subsytems page。关于G&H集团专家医疗设备制造公司ITL的能力的进一步信息,可以在其上找到site

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网络研讨会OCT系统

An overview of the complexities of OCT system design for manufacture.

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