Sound absorption vs frequency

Codefragmenten

curl "https://api.oanor.com/sonar-api/v1/absorption" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/sonar-api/v1/absorption", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/sonar-api/v1/absorption");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/sonar-api/v1/absorption",
    headers={"x-oanor-key": "oanor_test_..."}
)

Voorbeeldrespons

Een echte respons van dit endpoint, vastgelegd bij de laatste health check.

{
    "data": {
        "note": "Seawater absorbs sound more strongly at higher frequencies (Thorp's formula): low frequencies travel far, which is why long-range sonar and whale calls are low-pitched, while high-frequency sonar gives sharp images but only at short range. The loss adds to the spreading loss, so doubling the frequency roughly quadruples the absorption at sonar frequencies. Near-surface, ~4 °C water.",
        "inputs": {
            "range_km": 5,
            "frequency_khz": 10
        },
        "absorption_loss_db": 5.94,
        "absorption_db_per_km": 1.187
    },
    "meta": {
        "timestamp": "2026-06-06T23:53:52.010Z",
        "request_id": "7cccc13d-7ad1-46c2-bdb0-6b45f989fd6e"
    },
    "status": "ok",
    "message": "Absorption",
    "success": true
}