# 📐  L2 Spec — Active Thermography (pulsed / lock-in IR inspection) Mismatch-Only Spec

**ID:** `L2-115-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-115`](/artifact/l1/L1-115)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41554203

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 2048 |
| W | px | 128 – 2048 |
| Snr db | dB | 0.0 – 40.0 |
| N frames | — | 30 – 2000 |
| F lockin hz | Hz | 0.01 – 100 |
| Convective losses | — | 0.0 – 0.3 |
| Surface reflections | — | 0.0 – 0.3 |
| Ambient thermal load | — | 0.0 – 0.2 |
| Emissivity variation | — | 0.0 – 0.3 |

## 2. Tolerance (ε)

**Type:** `fn`

```
15.0 + 0.3 * SNR_dB - 10.0 * emissivity_variation - 5.0 * surface_reflections
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |

## 4. Fingerprint

`5fe229020ff761269fe35449a9cce4571dedf99c64d1216c3dcf8898bae0278a`

## 5. On-chain Registration

- **Chain hash:** `0xfd598aa19e9116561f45281e0a1dbb206bec45b46c09b74e3b9d13b59e825cfe`
- **Chain tx hash:** `0x0b54ab5c89cd30ab98df9d345477ed1109da7b2bece0da8151876e94ef870978`
- **Chain block:** `41554203`

---

## File Mapping

This bundle consists of: `L2-115-001.md`, `L2-115-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-115-001.md` | Source of truth — edit this | Human or LLM |
| `L2-115-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-115-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._