Hamamatsu IRA-256 / IRA-512 Thermoelectrically Cooled InGaAs Linear Array Detector

Overview

The Hamamatsu IRA-256 and IRA-512 are thermoelectrically cooled indium gallium arsenide (InGaAs) linear array detectors engineered for high-fidelity near-infrared (NIR) spectroscopy applications in laboratory, industrial, and OEM instrumentation environments. Operating across a broad spectral range of 800–1700 nm, these detectors leverage the intrinsic quantum efficiency and low dark current characteristics of InGaAs photodiode arrays to deliver stable, low-noise signal acquisition under demanding optical conditions. The integrated Peltier cooling system maintains the sensor die at < +5 °C—regardless of ambient temperature up to 24 °C—significantly suppressing thermal dark current and enabling extended integration times without saturation. This thermal stabilization is critical for quantitative NIR reflectance, transmission, and absorption measurements where signal-to-noise ratio (SNR) and long-term baseline stability directly impact analytical repeatability. Designed for seamless integration into spectrometer optical benches, the detectors feature a narrow 500 µm tall pixel geometry optimized for collimated beam coupling and minimal stray-light sensitivity. Their modular mechanical footprint and standardized electrical interfaces support rapid deployment in both benchtop and embedded systems.

Key Features

• Two standard configurations: 256-pixel (12.8 mm active length) and 512-pixel (25.6 mm active length) linear arrays
• Uniform 50 µm pixel pitch and 50 µm × 500 µm pixel geometry for consistent spatial sampling and optical alignment
• On-chip thermoelectric (TE) cooling achieving stable sensor temperatures below +5 °C at room ambient (24 °C)
• Dual operating modes: High-Sensitivity Mode (5×10⁶ e⁻ full-well capacity, 800 e⁻ read noise) and High-Dynamic-Range Mode (130×10⁶ e⁻ full-well capacity, 10 k e⁻ read noise)
• Factory-calibrated defective pixel mapping with ≤5 non-adjacent bad pixels (IRA-512); zero defective pixels (IRA-256)
• Flexible digitization: USB 14-bit interface for lab-based systems or PCI 12-bit interface for real-time embedded control
• Built-in hardware-level bad-pixel correction and programmable gain control
• Real-time acquisition capability exceeding 20 full-array spectra per second

Sample Compatibility & Compliance

These detectors are compatible with standard Czerny–Turner, transmission grating, and off-axis parabolic spectrometer architectures optimized for the 800–1700 nm range. They are routinely deployed in applications requiring compliance with ISO 17025-accredited measurement workflows, including pharmaceutical raw material identification (per USP ), polymer composition analysis (ASTM D6645), and agricultural moisture quantification (ISO 21515). While the detector itself is not an end-product medical device, its performance parameters—including linearity (±0.5% over 95% of dynamic range), temperature-stabilized dark current reproducibility (<2% variation over 8-hour operation), and traceable calibration documentation—support validation under GLP and GMP frameworks. All units ship with NIST-traceable spectral responsivity data and dark signal characterization reports.

Software & Data Management

The included D7401 SpectraArray Basic software provides immediate plug-and-play functionality for spectrum acquisition, baseline correction, peak integration, and export to CSV or ASCII formats. For advanced spectral modeling, optional D7404 SpectraSolve offers multivariate calibration tools (PLS, PCR), spectral library matching, and batch processing compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, audit trails, and user-access controls. The OEM Developers Kit (D7421) delivers fully documented C++ and Visual C++ APIs with production-ready examples for custom instrument firmware integration. LabVIEW drivers (D7422) include VI libraries compatible with LabVIEW 5.0 and later, supporting synchronized triggering, multi-channel synchronization, and real-time waveform streaming via shared memory buffers.

Applications

• NIR process analytical technology (PAT) for continuous monitoring of chemical reactions and blend uniformity in pharma manufacturing
• Portable and handheld spectrometers for field-based soil organic carbon and grain protein analysis
• FT-NIR and dispersive NIR systems used in quality control of lithium-ion battery cathode materials (e.g., LiCoO₂, NMC)
• OEM integration into gas analyzers targeting CH₄, CO, and NH₃ absorption features between 1100–1650 nm
• Research-grade hyperspectral imaging systems utilizing line-scan illumination and push-broom acquisition
• Calibration reference modules for wavelength and radiometric validation of NIR spectrophotometers

FAQ

What cooling performance can be expected under non-standard ambient conditions?

The TE cooler maintains chip temperature < +5 °C up to 35 °C ambient; above this, active heat-sink management (e.g., forced-air or liquid-cooled cold plate) is recommended to preserve dark current specifications.

Is firmware upgrade capability supported?

Yes—USB-connected units support field-upgradable firmware via D7401 or D7404 software; PCI variants require host-system reflash using provided utilities.

Are radiometric calibration certificates included?

Each unit ships with a factory spectral responsivity curve (nm vs. A/W) and dark current vs. temperature report; NIST-traceable calibration services are available as an add-on option.

Can the detector operate in triggered external sync mode?

Yes—both USB and PCI versions support TTL-compatible external trigger input (rising-edge) with sub-microsecond jitter, enabling precise synchronization with pulsed light sources or motorized stages.

What is the mean time between failures (MTBF) under continuous operation?

Based on accelerated life testing per IEC 62380, MTBF exceeds 50,000 hours at < +5 °C operating temperature and 60% relative humidity (non-condensing).