Audience-Scan Exposure
Calculate accumulated scan exposure and compare it with a caller-supplied limit.
Description
Repeated beam passes accumulate radiant exposure from power, dwell time and area.
When to use Audience-Scan Exposure
Use this tool to calculate accumulated scan exposure and compare it with a caller-supplied limit.
Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
How to use Audience-Scan Exposure and understand its results
- Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
- Enter averagePowerWatts, dwellSecondsPerPass, spotAreaSquareMeters, passCount, exposureLimitJPerM2 using the field table and calculation rules, then run the tool.
- Read radiantExposureJPerM2, limitMarginJPerM2, withinLimit. 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 |
|---|---|---|---|
| averagePowerWatts | Average beam power (W) | number; minimum: 0 | Required |
| dwellSecondsPerPass | Dwell time per pass (s) | number; minimum: 0 | Required |
| spotAreaSquareMeters | Spot area (m²) | number; minimum: 0 | Required |
| passCount | Pass count | integer; minimum: 0 | Required |
| exposureLimitJPerM2 | Caller exposure limit (J/m²) | number; minimum: 0 | Required |
Enter nonnegative power, dwell and exposure limit, nonnegative integer pass count and positive spot area. Return J/m², margin and inclusive gate.
exposure=P×dwellPerPass×passes/area; margin=limit−exposure Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| radiantExposureJPerM2 | Accumulated radiant exposure (J/m²) | number; minimum: 0 |
| limitMarginJPerM2 | Exposure-limit margin (J/m²) | number |
| withinLimit | Within limit | boolean |
{
"input": {
"averagePowerWatts": 0.01,
"dwellSecondsPerPass": 0.001,
"spotAreaSquareMeters": 0.000001,
"passCount": 2,
"exposureLimitJPerM2": 25
},
"output": {
"radiantExposureJPerM2": 20.000000000000004,
"limitMarginJPerM2": 4.9999999999999964,
"withinLimit": true
}
}Limitations and assumptions
No permissible-exposure standard, pulse correction, scan failure, beam profile or audience-scanning approval is determined.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Audience Safe Distance: Estimate projector distance needed to meet a caller-supplied irradiance limit. For a complementary task, use Required Optical Density: Calculate required optical density from unprotected and permissible exposure values in matching units.
Further background: OSHA Technical Manual: Laser Hazards.
References
-
Audience-Scan Exposure — tool.io
-
OSHA Technical Manual: Laser Hazards — Occupational Safety and Health Administration
Similar or alternative tools
- Audience Safe Distance
Estimate projector distance needed to meet a caller-supplied irradiance limit.
- Required Optical Density
Calculate required optical density from unprotected and permissible exposure values in matching units.