Source: https://guthlabs.ai/docs/instruments/wien-s-displacement-law-calculator/implementation/

instrument implementation / implementation-contract

# Wien's Displacement Law Calculator implementation

A source-bound implementation contract for Wien's Displacement Law Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-230

**Effect**: Computation or source lookup only

## Input and validation requirements

The plain arithmetic formula produces an undefined result at T=0 K, can overflow to Infinity for an extremely small positive temperature, and produces a negative nonphysical wavelength for negative temperatures unless explicit input validation is added. A bare temperature value also permits a K-versus-°C convention error.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "T_K": 300
  },
  "expected_outputs": {
    "lambda_max_m": 0.00000966,
    "lambda_max_um": 9.66,
    "spectral_band": "infrared"
  },
  "working": "λ_max = b/T = (2.898e-3 m·K)/(300 K) = 0.00000966 m = 9.66e-6 m = 9.66 μm. This is infrared."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/wien-s-displacement-law-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/wien-s-displacement-law-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/wien-s-displacement-law-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`