Custom Infrared Dome Selection Guide: Material, Coating & Engineering Specification

Custom Infrared Dome Selection Guide: Material, Coating & Engineering Specification

For ROV/AUV subsea monitoring, thermal imaging cameras, LWIR detection, and industrial optical systems, off-the-shelf infrared domes often fail to match unique housing structures, pressure resistance standards, spectral requirements, and environmental durability demands. Custom infrared dome manufacturing solves the compatibility pain points of standard products, delivering fully tailored optical performance, mechanical stability and assembly adaptability.

Hong Kong Felix Optical Glass Co., Limited provides one-stop custom infrared dome solutions covering material customization, structural machining, precision coating, pressure simulation testing and finished product inspection. This professional selection guide helps system integrators, OEM engineers and marine project teams quickly lock the optimal custom dome specification and avoid engineering and procurement mistakes.

Core Principle of Custom Infrared Dome Selection

The selection of custom infrared domes cannot rely solely on diameter or material name. Qualified customized optical domes need to balance four core engineering dimensions: infrared spectral transmittance, mechanical structural strength, environmental adaptability, and assembly matching accuracy.

Different application scenarios correspond to completely different material grades, wall thickness designs, coating schemes and tolerance standards. Blindly pursuing high hardness or ultra-high transmittance will lead to cost waste or field operation failure. All customized specifications must be confirmed based on actual working wavelength, pressure load, working medium and installation structure.

Material Grade Selection: ZnSe vs Standard ZnS vs Multispectral ZnS

Material substrate is the core factor determining dome optical performance and service life, and is the primary customization item for infrared domes.

ZnSe Infrared Dome
ZnSe features ultra-wide infrared transmission band of 0.6μm–16μm and extremely low absorption rate for CO₂ laser wavelength. It is the preferred material for high-precision thermal imaging and laser optical systems. Its disadvantage is low mechanical hardness and poor scratch resistance.

Applicable scenarios: Indoor precision infrared detection, clean environment thermal imaging, laser optical equipment.
Inapplicable scenarios: Deep-sea high pressure, long-term seawater corrosion, high-friction harsh environments.

Standard ZnS Infrared Dome
Standard ZnS balances infrared transmittance and mechanical performance. Compared with ZnSe, it has higher hardness, better impact resistance, abrasion resistance and moisture corrosion resistance. It is the most cost-effective material for industrial and marine conventional infrared systems.

Applicable scenarios: Shallow water ROV cameras, outdoor thermal monitoring, humid industrial environments.
Feature supplement: Slightly higher infrared absorption than ZnSe, which can be fully optimized through professional AR coating.

Multispectral ZnS Infrared Dome
Multispectral ZnS supports dual-band transmission of visible light + infrared light, meeting the dual imaging requirements of visible light monitoring and long-wave infrared detection. It has stricter manufacturing standards and better comprehensive environmental adaptability.

Applicable scenarios: Dual-band optical systems, military monitoring, multi-spectral detection equipment.

Custom Key Structural & Optical Parameters

To achieve perfect equipment matching and stable optical performance, the following customized parameters must be clearly defined in the RFQ stage, which is also the core basis for quotation and production:

1. Spectral working band: Clarify MWIR, LWIR 8–14μm or dual-band requirements to lock material and coating wavelength calibration standards
2. Structural dimensions: Outer diameter, inner radius, uniform wall thickness, edge chamfer and integrated flange size
3. Assembly parameters: Housing matching size, sealing position, retention structure and assembly clearance tolerance
4. Mechanical environment: Working pressure difference, seawater/fresh water medium, operating temperature range
5. Optical indicators: Surface figure accuracy, scratch-dig grade, transmitted wavefront error
6. Inspection standards: Required test reports, sampling inspection standards and acceptance thresholds

For customers without finalized drawings, our engineering team can provide budget quotation based on approximate dimensions and application scenarios, and formal production specifications will be confirmed after technical docking.

Custom Coating Solution Matching Rules

Coating customization directly determines the final infrared transmittance and environmental durability of the dome, and is an indispensable part of custom dome engineering design.

AR Anti-Reflection Coating
Customized single-layer or multi-layer AR coating according to the target wavelength band, which effectively reduces surface reflection loss and maximizes infrared light transmittance. Customers need to specify coating surfaces, uncoated reserved areas, transmittance upper and lower limits, and light incidence angle range to ensure consistent optical performance of the whole machine.

DLC Diamond-Like Carbon Coating
DLC hard coating is a customized upgrade for harsh environments. It significantly improves the scratch resistance, salt spray corrosion resistance and waterproof moisture resistance of the dome surface, and is specially customized for subsea long-term working infrared domes.

Pressure Resistance & Harsh Environment Customization Scheme

The pressure resistance of custom infrared domes cannot be judged by material alone. We support targeted customized optimization for high-pressure and harsh working conditions:

• Carry out FEA pressure simulation according to target water depth and pressure load, optimize dome wall thickness and curvature structure
• Customize enhanced sealing and anti-corrosion schemes for seawater corrosion environments
• Adjust machining tolerance and structural stability standards for high temperature difference and vibration working conditions

Only the customized design integrating dome substrate, structural size and installation matching structure can meet the long-term stable operation requirements of deep-sea and industrial harsh environments.

Optical Testing & Custom Inspection Report Service

Different project certification standards correspond to different inspection customization requirements. We support full-process customized inspection items and provide traceable official reports:

• Raw material grade certification report
• Dimensional tolerance full inspection data
• Surface scratch-dig and flatness inspection report
• Full-band spectral transmittance test report
• Finished product optical wavefront detection report

We will distinguish witness sample test and finished product batch test according to customer requirements to meet OEM batch delivery and project certification standards.

Prototype Customization & Mass Production Process

We support complete customized processes from prototype trial production to formal mass production:

1. Custom prototype samples for assembly fitting test, optical performance test and environmental aging test
2. Freeze all specifications after the prototype is qualified, update drawings, coating standards and inspection rules
3. Record all approved technical deviations to ensure consistent standards for mass production and repeated orders

Small-batch prototype orders and large-batch customized mass production are both acceptable, with flexible MOQ and adjustable production cycle according to customization difficulty.

Why Do Custom Dome Quotations Differ With The Same Diameter?

Many customers encounter price differences for infrared domes of the same caliber, which comes from multiple hidden customized parameters: different material grades, curvature precision standards, wall thickness tolerance, coating types, inspection scope, tooling cost and testing standards.

We insist on quoting based on full customized technical parameters, clearly marking all manufacturing standards and assumed conditions, avoiding low-price single-standard quotation and subsequent performance mismatch risks.

How To Launch Custom Infrared Dome RFQ

Send your dimensional drawings or sketches, working wavelength band, application scenarios and order quantity to our official email: james@felixglass.com

Recommended Email Subject: Custom Infrared Dome RFQ — [Material / Diameter / Quantity]

Our international sales director and optical engineering team will provide one-on-one technical review, scheme optimization and accurate formal quotation.

Professional Q&A Support

For more technical questions about material selection, coating customization, pressure resistance standards, MOQ and lead time, please check our exclusive technical page: Infrared Dome Knowledge Base