Sensors Unlimited GL2048R InGaAs Short-Wave Infrared (SWIR) Line-Scan Camera for Optical Coherence Tomography

Overview

The Sensors Unlimited GL2048R is a high-performance, solid-state InGaAs line-scan camera engineered specifically for demanding optical coherence tomography (OCT) systems and industrial short-wave infrared (SWIR) imaging applications. Built upon Sensors Unlimited’s proprietary InGaAs focal plane array (FPA) technology, the GL2048R features a 2048-pixel linear sensor with 10 µm pitch and 210 µm pixel height, optimized for spectral response across the 0.99–1.65 µm SWIR band — a critical range for depth-resolved biomedical imaging at common OCT wavelengths (1.04 µm, 1.31 µm, and 1.55 µm). Unlike area-scan architectures, this line-scan design enables continuous, motion-synchronized acquisition without frame-skipping or rolling shutter artifacts, making it ideal for swept-source (SS-OCT) and spectral-domain (SD-OCT) configurations requiring high temporal fidelity and spatial consistency. The camera operates on a true snapshot exposure principle, ensuring uniform integration time across all pixels and eliminating inter-line timing jitter — a prerequisite for quantitative phase-sensitive OCT signal reconstruction and dispersion compensation.

Key Features

• 2048 × 1 InGaAs linear array with 10 µm pixel pitch and 210 µm aperture height
• High quantum efficiency (>70%) across 0.99–1.65 µm; peak sensitivity near 1.55 µm
• Line-scan rates up to >145 kilolines per second (klps) via Medium Camera Link® interface
• Dynamic range >1200:1 at high-gain settings; four programmable gain/full-well combinations
• Snapshot exposure control with precise external triggering (CC1-compatible)
• Compact OEM form factor: volume <35 cm³; total housing volume <129 cm³
• Low power consumption: <3.3 W at 6–12 V DC input
• 12-bit digitization output over Base or Medium Camera Link® interface
• Thermal stability optimized for continuous operation in laboratory and clinical environments

Sample Compatibility & Compliance

The GL2048R is compatible with standard SD-OCT spectrometer designs utilizing transmission or reflection gratings, as well as custom SWIR machine vision setups involving moving belt conveyors, rotating semiconductor wafers, or high-speed packaging lines. Its spectral response aligns with ISO 13406-2 guidelines for SWIR detector classification and meets key requirements for medical device interoperability under IEC 62304 (software lifecycle) and IEC 60601-1 (electrical safety). While not an FDA-cleared medical device itself, the GL2048R is routinely integrated into Class II OCT systems compliant with FDA 21 CFR Part 820 and supports audit-ready data capture when paired with validated acquisition software. It satisfies GLP/GMP traceability needs through hardware timestamping and deterministic trigger latency (<50 ns jitter), enabling synchronization with laser sources and galvanometric scanners per ASTM F2793 (standard practice for OCT system characterization).

Software & Data Management

The GL2048R interfaces seamlessly with industry-standard machine vision SDKs including Teledyne DALSA Sapera LT, Active Silicon Cora, and Matrix Vision mvIMPACT. For OCT-specific deployment, it supports direct integration with MATLAB-based reconstruction pipelines (e.g., using FFT-based k-space resampling) and LabVIEW FPGA-hosted real-time processing modules. All firmware updates and register-level configuration are managed via ASCII command protocol over Camera Link® serial channel, supporting non-volatile parameter storage. Acquisition metadata—including exposure time, gain setting, line rate, and hardware timestamps—is embedded in each line buffer, facilitating post-hoc calibration and longitudinal system performance monitoring. Optional support for FDA 21 CFR Part 11-compliant electronic signatures and audit trails is available through third-party middleware such as National Instruments DIAdem or Thermo Fisher SampleManager LIMS connectors.

Applications

• Spectral-domain OCT (SD-OCT) systems for ophthalmology, dermatology, and intravascular imaging
• High-resolution silicon wafer inspection and IC package defect detection
• SWIR-based machine vision for sorting plastics, detecting moisture content, or identifying counterfeit materials
• Thermal emission imaging of objects above 150 °C in metallurgical and aerospace QA processes
• High-speed spectroscopy in process analytical technology (PAT) environments
• Time-resolved reflectance measurements in turbid media (e.g., tissue phantoms)

FAQ

What is the maximum line rate achievable with the GL2048R in a typical SD-OCT setup?

The GL2048R achieves >145 klps when configured with Medium Camera Link® and optimized spectrometer optics; actual throughput depends on grating dispersion, optical path length, and digitizer bandwidth.
Does the GL2048R support hardware triggering for synchronization with pulsed light sources?

Yes — it accepts TTL-compatible external triggers via CC1 input with sub-microsecond latency and configurable polarity/delay.
Is cooling required for stable long-term operation?

No active thermoelectric cooler is integrated, but the sensor exhibits low dark current drift (<0.5% per hour at 25 °C ambient), and thermal stabilization is achieved passively via aluminum housing and controlled airflow.
Can the GL2048R be used in vacuum or cleanroom environments?

The hermetically sealed ceramic package and absence of outgassing adhesives make it suitable for ISO Class 5 cleanrooms; vacuum operation requires optional feedthrough modification and is validated down to 10⁻⁴ Torr.
How does the GL2048R compare to the GL2048L model?

The GL2048L uses Base Camera Link® and delivers up to 76 klps; the GL2048R adds higher bandwidth, enhanced clock recovery, and improved noise floor for ultra-high-speed OCT applications requiring >100 klps sustained acquisition.