Examples
Examples
Try the starting example
- Light height above water (cm)
- 30
- Measured full beam angle along length (degrees)
- 90
- Measured full beam angle across width (degrees)
- 60
- Tank length (cm)
- 100
- Tank width (cm)
- 40
- Nominal footprint length (cm)
- 60
- Nominal footprint width (cm)
- 34.641016
- Centred rectangular footprint coverage fraction
- 0.519615
Try another scenario
- Light height above water (cm)
- 33
- Measured full beam angle along length (degrees)
- 90
- Measured full beam angle across width (degrees)
- 60
- Tank length (cm)
- 100
- Tank width (cm)
- 40
- Nominal footprint length (cm)
- 66
- Nominal footprint width (cm)
- 38.105118
- Centred rectangular footprint coverage fraction
- 0.628734
Calculation method
Calculation method
Nominal footprint length (cm)
Footprint dimensions=2height tan(beamAngle/2); centred rectangle intersection divided by tank area.
Nominal footprint width (cm)
Footprint dimensions=2height tan(beamAngle/2); centred rectangle intersection divided by tank area.
Centred rectangular footprint coverage fraction
Footprint dimensions=2height tan(beamAngle/2); centred rectangle intersection divided by tank area.
Symbols and units
- a
- Light height above water (cm)
- b
- Measured full beam angle along length (degrees)
- c
- Measured full beam angle across width (degrees)
- d
- Tank length (cm)
- e
- Tank width (cm)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Geometric rectangular beam convention; illumination intensity/uniformity not estimated. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Geometric rectangular beam convention; illumination intensity/uniformity not estimated.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.