Custom Infrared Dome Cost: Key Factors Affecting Your Quotation
Custom Infrared Dome Cost: What Affects Your Quotation?
Two infrared domes with the same outside diameter can have very different prices.
Diameter describes only part of the component. Material grade, wall geometry, optical tolerances, coating requirements and inspection scope also influence the work required to manufacture and verify it.
For OEM buyers, understanding these factors helps make quotations easier to compare. It also reveals where a specification can be refined to reduce cost while preserving the performance the system needs.
Why Outside Diameter Is Not Enough for Pricing
An enquiry for a “100 mm infrared dome” leaves several manufacturing questions unresolved.
Is the component a complete hemisphere or a shallow spherical cap? Does it include a flange? What wall thickness is required? Which surfaces need optical polishing and coating?
Without these details, a supplier may provide only a preliminary estimate based on assumptions.
A useful quotation should identify its technical basis, including the drawing revision, material grade, coating specification and quantities.
1. Material and Grade
The quotation should identify the exact substrate being proposed.
For example, “ZnS” may refer to standard CVD material or multispectral material. These should be treated as distinct quotation options rather than assumed to be interchangeable.
Material availability, required blank dimensions and documentation can also affect the quotation.
If the material remains open, provide the operating wavelengths and performance requirements. Ask the supplier to identify any proposed alternative and explain what would need to be verified before accepting it.
2. Dome Geometry and Manufacturing Access
Geometry influences how the component can be held, machined, polished and inspected.
Important features include:
| Geometry feature | Question for review |
|---|---|
| Dome height | Is it a hemisphere, shallow cap or another profile? |
| Wall thickness | What thickness and variation are required? |
| Inner curvature | Can the required surface be accessed and processed? |
| Rim or flange | How will the component be supported during manufacture? |
| Edge details | Are special radii, chamfers or transitions required? |
| Clear aperture | Which areas must meet optical requirements? |
A small change to a mounting feature may affect several manufacturing steps. Where the design allows flexibility, invite manufacturing comments before freezing the drawing.
Any proposed change should still be reviewed for optical and mechanical suitability.
3. Dimensional Tolerances
Tolerances should reflect the function of each feature.
A seating diameter may require close control for assembly, while a non-contact feature may permit a wider tolerance. Applying the same tight tolerance to every dimension can create unnecessary manufacturing and inspection work.
Review each requirement by asking:
- Does it control fit, sealing or alignment?
- Does it affect optical performance?
- Can it be measured consistently from the stated datum?
- Is the proposed tolerance necessary for the application?
This review should be led by the design requirements. Cost reduction should not depend on relaxing a critical tolerance without evaluating the consequences.
4. Optical Quality Requirements
Surface appearance and optical performance are separate parts of the specification.
Scratch-dig requirements address surface imperfections. Surface figure, roughness and transmitted wavefront requirements address other characteristics and may require different manufacturing or inspection methods.
For a meaningful quotation, define the clear aperture, test conditions and acceptance metric for each applicable requirement.
Avoid requesting the tightest available specification by default. Instead, identify the optical performance the system needs and determine how the component specification supports it.
5. AR Coating Scope
“Both sides AR coated” is not a complete coating specification.
The quotation may depend on the wavelength bands, incidence angles, coated areas, acceptance limits and durability requirements.
| Coating parameter | What the RFQ should define |
|---|---|
| Spectrum | Required bands or individual wavelengths |
| Performance | Minimum, average or selected-wavelength limits |
| Incidence angle | Relevant angle or angle range |
| Surfaces | External, internal or both |
| Masking | Mounting or bonding areas to remain uncoated |
| Durability | Applicable exposure and test requirements |
| Verification | Finished-part and witness-sample requirements |
Compare coating quotations against the same conditions. A narrower-band proposal should not be treated as equivalent to a broader requirement unless the system designer accepts the difference.
6. Inspection and Documentation
Inspection is part of the order scope.
A quotation that includes dimensional results and surface inspection may differ from one requiring additional spectral testing, optical measurements or environmental evaluations.
State which reports are required with delivery and how critical requirements will be verified.
If a supplier proposes an alternative test method, resolve it before ordering. Agreement at the quotation stage helps avoid unexpected costs or acceptance disputes later.
7. Prototype Quantity and Setup Work
A custom order may involve fixture preparation, tooling, process development or inspection setup.
Ask the supplier to separate non-recurring charges from the recurring component price where practical. This makes the cost structure easier to understand.
Useful quotation lines may include:
- Engineering or development charges, if applicable.
- Tooling and fixtures.
- Prototype components.
- Coating and testing.
- Packaging and shipping.
A prototype unit price should not automatically be used as the expected production price. Likewise, a lower repeat-order price should be confirmed against the final design, quantity and production scope.
8. Order Quantity and Delivery Schedule
Request prices at realistic quantity levels.
For example, a project may need a small prototype batch followed by scheduled production releases. Sharing that purchasing pattern helps the supplier quote the actual requirement.
Also distinguish the required delivery date from a preferred date. If an accelerated schedule is needed, ask whether it changes the manufacturing plan, price or documentation scope.
Do not assume that a large forecast is equivalent to a committed order. Keep forecast quantities and purchase quantities clearly identified.
How to Compare Two Infrared Dome Quotations
Before comparing unit prices, check whether both offers cover the same component and acceptance requirements.
| Comparison item | What to confirm |
|---|---|
| Drawing | Same part number and revision |
| Material | Same grade or clearly identified alternative |
| Geometry | No unapproved dimensional changes |
| Optical quality | Same requirements and clear aperture |
| Coating | Same bands, angles, surfaces and limits |
| Inspection | Same methods and delivery reports |
| Quantity | Same order and release quantities |
| Extra charges | Tooling, testing, packaging and freight identified |
| Delivery | Comparable lead-time basis |
| Deviations | Exceptions stated explicitly |
A lower price may represent a different scope. Understanding that difference is essential before deciding which offer provides better value.
Practical Ways to Improve Cost Efficiency
Start by removing uncertainty from the RFQ.
Provide a controlled drawing, distinguish critical features from non-critical ones, and define optical performance in measurable terms. Ask the manufacturer to flag requirements that create significant cost or feasibility concerns.
Where appropriate, request alternative proposals with clearly stated deviations. Each option should explain what changes and which requirements remain satisfied.
For repeat orders, keep the approved configuration consistent. If changes are necessary, identify the new revision and request a review of its effect on price and delivery.
The objective is a component specification that is precise enough to control performance and practical enough to manufacture repeatedly.
What to Send for a Useful Budgetary Estimate
If a final drawing is not yet available, send:
- Approximate diameter, height and wall thickness.
- A sketch of the dome and mounting interface.
- Operating wavelengths.
- Preferred material and acceptable alternatives.
- Preliminary optical and coating requirements.
- Prototype and expected production quantities.
- Required delivery location and schedule.
Clearly mark the enquiry as preliminary. The estimate can then identify its assumptions and the information needed for a firm quotation.
Request a Custom Infrared Dome Quotation from Felix Glass
Send Felix Glass your drawing, operating wavelengths, coating requirements and quantities.
If you are working toward a target budget, include it with the enquiry. This provides a basis for discussing feasible options and identifying which specifications need further review.
Contact: James Fu
Company: FELIX OPTICAL GLASS
Email: james@felixglass.com
Website: https://www.felixglass.com/
