The HIS550R-0WC shares the same thermal emission mechanism as the HIS550R-0. Electrical current through the NiCr filament raises its temperature to approximately 600 °C; the nanostructured surface (emissivity >0.9) then radiates energy across a broad Planck-governed spectrum spanning 2–20 µm. The gold-plated reflector surrounding the element captures rear-hemisphere radiation and redirects it forward, recovering energy that would otherwise be absorbed by the package walls.

The Winston cone is mounted over the reflector aperture. Its geometry is derived from the edge-ray principle of non-imaging optics: the cone profile is computed such that any ray entering at the maximum acceptance half-angle exits within the output half-angle, and no ray entering outside that acceptance angle is transmitted. The result is a well-defined output beam with substantially reduced divergence compared to the bare reflector, and near-ideal throughput efficiency within the accepted solid angle.

In NDIR gas sensing, the collimated output couples efficiently into narrow gas cells and small detector apertures. Pulsed modulation at up to 6 Hz enables synchronous lock-in detection, rejecting DC thermal background and low-frequency noise to achieve stable, low-drift concentration measurements in field-deployed instruments.

Winston Cone Beam Shaping for Maximum Coupling Efficiency

The Winston cone collimator is the defining feature that differentiates the HIS550R-0WC from the HIS550R-0. Derived from non-imaging optics theory, the cone profile maximises the fraction of emitted power delivered into a defined output cone angle — without the losses associated with refractive or diffractive optical elements. This is particularly valuable when coupling into gas cells, optical fibres, or detector apertures with small acceptance solid angles, where an uncollimated source would waste a large proportion of its output.

High Optical Output: Up to 190 mW

The 190 mW optical output of the HIS550R-0WC is drawn from the same 11 mm² element and 700 mW maximum electrical input as the HIS550R-0. The marginal reduction versus the open-reflector model (195 mW) reflects the small absorption loss of the Winston cone material; within the defined output cone, however, the power density delivered to the detector or cell aperture is substantially higher due to the reduced beam divergence.

Gold-Plated Reflector for Near-Lossless IR Reflection

Gold maintains reflectivity above 98% across the 2–20 µm band and does not form infrared-absorbing oxide layers, making it the optimum reflector material for long-life infrared applications. The integrated reflector captures rear-hemisphere emission from the filament and redirects it forward into the Winston cone input aperture, recovering energy that would otherwise be absorbed by the metal package walls.

Large 11 mm² Radiating Element

The 11 mm² filament area generates greater total radiant flux than the 1.8 mm² elements of the SMD emitter family. This large source area provides the Winston cone with sufficient input étendue to fill its acceptance aperture effectively, ensuring that the cone operates near its theoretical throughput limit.

Broadest Spectral Coverage: 2–20 µm

The open-window configuration provides unobstructed access to the full 2–20 µm range, including the long-wave infrared region where heavy hydrocarbons, refrigerants, and many complex organic molecules exhibit strong absorption features. No window material imposes a spectral cut-off, and the Winston cone itself introduces no wavelength-dependent transmission loss.

Patented Nanostructured High-Emissivity Surface

Emissivity exceeding 0.9 ensures that the filament behaves as a near-ideal blackbody radiator, maximising the conversion of electrical power to radiant flux and producing a spectrally smooth output that closely follows the Planck curve. This simplifies filter selection and system calibration in quantitative spectroscopic instruments.

Pulsed Operation for Lock-In Detection

Modulated emission at up to 6 Hz supports synchronous detection architectures in NDIR sensor electronics. Lock-in techniques referenced to the modulation frequency reject broadband thermal background and 1/f noise, significantly improving measurement signal-to-noise ratio and long-term baseline stability in field instruments.

Robust TO-39 / TO-5 Industrial Package

The hermetic TO-39 metal package provides mechanical robustness, good thermal dissipation, and resistance to vibration and thermal cycling. It is a standard platform in industrial optoelectronics with well-established assembly and mounting practices, reducing integration effort in both laboratory and field-deployed instruments.

• NDIR Gas Sensing with Small Optical Apertures: Compact gas cells and miniaturised detector assemblies where beam divergence control is critical for maximising the fraction of source power reaching the detector active area.
• Fibre-Coupled Infrared Spectroscopy: Systems using infrared optical fibres or light guides to deliver radiation to a remote measurement point, where efficient coupling into the fibre acceptance cone is essential.
• Miniaturised Multipass Gas Cells: Herriott and White cell configurations where the beam must re-enter a small injection aperture on each pass; reduced divergence significantly improves multipass efficiency and effective optical path length.
• Industrial Gas Analysis and Process Monitoring: Process gas analysers, CEMS, and fixed-point safety detectors in petrochemical, pharmaceutical, and industrial facilities requiring stable high-power infrared sources.
• Automotive and Engine Exhaust Analysis: Exhaust gas analysers and emission certification benches measuring CO, CO₂, HC, and NOx across multiple spectral bands simultaneously.
• Medical and Clinical Gas Analysis: High-accuracy capnography, anaesthetic gas monitoring, and respiratory gas analysers where efficient optical coupling into small-aperture sensor modules is required.
• Scientific Research Instrumentation: Custom spectrometers, optical bench experiments, and gas reference cell systems requiring a stable, high-power, geometrically controlled broadband infrared source.

United Spectrum Instruments (USI) is a specialist distributor and application partner for advanced photonics, infrared sensing, and scientific instrumentation in India. USI combines access to globally leading component technologies with deep domain expertise, supporting customers from initial product selection through OEM system integration and volume production supply.

Key reasons to work with United Spectrum Instruments:

• Access to internationally leading infrared emitter and photonics technologies
• Expert application support for NDIR gas sensing, spectroscopy, and high-power IR system design
• OEM consultation covering component selection, optical system design, and production ramp
• Reliable supply for evaluation samples and production quantities
• Established partnerships with leading international photonics manufacturers
• Fast, responsive technical communication and application-focused engineering guidance