Iris Diaphragm Aperture Range Lookup
Invert actual measured iris/beam-diameter calibration at caller matched throw only inside observed range; not a universal diaphragm scale, beam-angle assumption or fixture aperture compatibility.
Description
A measured iris-to-beam calibration can be inverted within the observed range.
A measured iris-to-beam calibration can be inverted within the observed range. Throw conditions must match the calibration.1
Enter aligned positive calibration lists with at least two increasing apertures; projected diameters must also strictly increase for interpolation. Enter a positive in-range requested diameter. Return interpolated aperture.
When to use Iris Diaphragm Aperture Range Lookup
Use Iris Diaphragm Aperture Range Lookup when you need to evaluate the supplied records under the calculation and evidence rules below. No extrapolation, universal iris scale or fixture compatibility is supplied.
Prepare the actual venue, production, inventory or financial records requested. Confirm units and supply applicable local limits or verified catalog values.
How to use Iris Diaphragm Aperture Range Lookup and understand its results
- Prepare the actual venue, production, inventory or financial records requested. Confirm units and supply applicable local limits or verified catalog values.
- Enter callerObservedIrisApertureMm, matchedProjectedBeamDiametersM, requestedProjectedDiameterM using the field table and calculation rules, then run the tool.
- Read interpolatedIrisApertureMm. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| callerObservedIrisApertureMm | Caller observed iris aperture mm | list of number | Required |
| matchedProjectedBeamDiametersM | Matched projected beam diameters m | list of number | Required |
| requestedProjectedDiameterM | Requested projected diameter m | number | Required |
Enter aligned positive calibration lists with at least two increasing apertures; projected diameters must also strictly increase for interpolation. Enter a positive in-range requested diameter. Return interpolated aperture.
aperture=piecewise-linear interpolation of diameter→aperture Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| interpolatedIrisApertureMm | Interpolated iris aperture mm | number |
{
"input": {
"callerObservedIrisApertureMm": [
10,
20,
30
],
"matchedProjectedBeamDiametersM": [
1,
2,
3
],
"requestedProjectedDiameterM": 2.5
},
"output": {
"interpolatedIrisApertureMm": 25
}
}Limitations and assumptions
No extrapolation, universal iris scale or fixture compatibility is supplied.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Dimmer Curve Profile Linear S-Curve Lookup: A dimmer curve is a calibration between control and measured light output. Generic profile names do not define every fixture’s response. For a complementary task, use Speaker Array Coverage Angle Venue Width Calculator: A centered audience-plane footprint determines an ideal horizontal angle. Measured speaker coverage is a separate input.
References
-
Iris Diaphragm Aperture Range Lookup — tool.io
Similar or alternative tools
- Dimmer Curve Profile Linear S-Curve Lookup
A dimmer curve is a calibration between control and measured light output. Generic profile names do not define every fixture’s response.
- Speaker Array Coverage Angle Venue Width Calculator
A centered audience-plane footprint determines an ideal horizontal angle. Measured speaker coverage is a separate input.