The HIS550R-0 operates as a pulsable resistive thermal emitter. Electrical current heats a NiCr-based filament element; at operating temperature, the element radiates energy across a broad infrared spectrum described by Planck’s law. The nanostructured surface treatment raises emissivity to greater than 0.9, ensuring that the spectral output closely follows the ideal blackbody curve and maximises radiant efficiency at the operating temperature of ~600 °C.

The gold-plated parabolic reflector surrounding the element serves a dual function. Gold has among the highest reflectivity of any metal across the infrared spectrum (typically >98% in the mid-IR), so rear-hemisphere radiation is redirected forward with minimal loss. This effectively doubles the collectable flux in the forward direction relative to an unpackaged element, increasing system signal budget without any increase in electrical power consumption.

In NDIR gas detection, infrared radiation from the emitter traverses a sample gas cell. Molecular species within the cell absorb radiation at their characteristic vibrational frequencies; a photodetector and narrowband optical filter downstream quantify the transmitted fraction to determine gas concentration. Pulsed modulation at up to 6 Hz enables synchronous lock-in detection, suppressing thermal background and low-frequency noise to achieve stable, low-drift measurements in long-term field deployments.

Highest Optical Output in the Product Family

At up to 195 mW of optical output, the HIS550R-0 delivers more than five times the radiant power of the 1.8 mm² SMD emitters. This large signal budget supports longer optical path lengths for improved sensitivity, operation through high-absorption sample media, and more relaxed requirements on detector sensitivity — all of which simplify instrument design and reduce overall system cost.

Large 11 mm² Radiating Element

The 11 mm² emitting area generates proportionally greater radiant flux at any given operating temperature. Larger source area also eases optical coupling into multipass cells and integrating sphere cavities, where matching the source étendue to the optical system is important for efficient collection.

Gold-Plated Reflector for Passive Optical Gain

Gold is the preferred reflector material for infrared optics due to its consistently high reflectivity (>98%) across the 2–20 µm band and its chemical inertness, which prevents oxidation-related degradation over the device lifetime. The integrated reflector directs rear-hemisphere emission forward, recovering otherwise wasted radiant energy and increasing forward radiant intensity without additional power draw.

Broadest Spectral Coverage: 2–20 µm

The open-window configuration (no glass or substrate in the optical path) provides unobstructed access to the full 2–20 µm range, including the long-wave infrared band beyond 14 µm where many complex molecules, refrigerants, and heavy hydrocarbons exhibit strong absorption features. This makes the HIS550R-0 the only model in the series capable of supporting applications in this spectral region.

Patented Nanostructured High-Emissivity Surface

The patented nanostructure process delivers emissivity exceeding 0.9 across the emission band, ensuring maximum conversion of electrical power into radiant flux and a spectrally predictable output that simplifies system calibration. Emissivity this high also means the spectral shape closely follows the Planck curve, making the source behaviour well-defined for quantitative spectroscopic work.

Robust TO-39 / TO-5 Industrial Package

The TO-39 / TO-5 hermetic metal package is widely used in precision optoelectronic components due to its mechanical robustness, excellent thermal dissipation, and compatibility with industrial assembly processes. The package withstands vibration, thermal cycling, and the environmental conditions encountered in field-deployed gas analysers and safety systems.

Pulsed Operation for Lock-In Detection

Modulated emission at up to 6 Hz supports synchronous detection architectures that reject DC thermal emission and broadband noise, significantly improving measurement signal-to-noise ratio. This is particularly important in high-sensitivity analytical instruments and long-path gas cells where background radiation management is critical.

• High-Sensitivity NDIR Gas Sensing: Long-path and multi-pass gas cells for trace-level detection of CO₂, CO, CH₄, N₂O, SO₂, NH₃, and other infrared-absorbing species where compact emitters cannot provide sufficient signal budget.
• Laboratory and Benchtop IR Spectroscopy: FTIR spectrometers, dispersive IR instruments, and custom analytical platforms requiring a high-radiance blackbody-like source across the full 2–20 µm fingerprint and long-wave region.
• Industrial Gas Analysis and Emissions Monitoring: Process gas analysers, CEMS, and stack emission monitors requiring stable, high-power infrared sources for continuous operation in harsh industrial environments.
• Automotive and Engine Exhaust Analysis: Exhaust gas analysers and emission certification test benches targeting CO, CO₂, HC, and NOx measurement across multiple spectral bands simultaneously.
• Fire Detection and Flame Sensing: Passive infrared flame detectors and hydrocarbon fire suppression systems operating in the 4.3 µm CO₂ emission band or the 2.7 µm H₂O band.
• Medical and Clinical Gas Analysis: High-accuracy capnography, anaesthetic gas monitoring, and multi-gas respiratory analysers where optical path losses require a higher-power source.
• Scientific Research Instrumentation: Custom spectrometers, gas reference cells, and optical bench experiments requiring a stable, high-power, 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