Resonant frequency

Code snippets

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

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

$ch = curl_init("https://api.oanor.com/helmholtz-api/v1/frequency");
curl_setopt($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/helmholtz-api/v1/frequency",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Helmholtz resonance f = (c/2π)·√(A/(V·L_eff)). The effective neck length adds an end correction (~0.85·r flanged, ~0.61·r free per end) so a short or open neck still resonates lower than its physical length suggests.",
        "inputs": {
            "area_m2": 0.0001,
            "neck_type": "flanged-unflanged",
            "volume_m3": 0.001,
            "neck_length_m": 0.05,
            "speed_of_sound_ms": 343
        },
        "wavelength_m": 4.794905,
        "resonant_frequency_hz": 71.534266,
        "angular_frequency_rad_s": 449.463052,
        "effective_neck_length_m": 0.05823717
    },
    "meta": {
        "timestamp": "2026-06-05T11:30:36.502Z",
        "request_id": "95b5eb71-e64d-4ac7-a836-32e37d05c9c4"
    },
    "status": "ok",
    "message": "Resonant frequency",
    "success": true
}