Pith Number

pith:DZHOVK7L

pith:2026:DZHOVK7LZP6VFOEOE35JUM7EJ4

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An Optical System for Monitoring Coil Parasitic Motion and Mass Position for Tsinghua Tabletop Kibble Balance

Kang Ma, Nanjia Li, Shisong Li, Songling Huang, Weibo Liu, Wei Zhao

A seven-channel optical system using confocal sensors tracks coil tilts, translations, and mass offsets in a tabletop Kibble balance.

arxiv:2605.16835 v1 · 2026-05-16 · physics.ins-det

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Claims

C1strongest claim

The initial experimental setup has been completed, featuring sufficient resolution and minimal signal loss, providing a new approach for alignment adjustment and corner error compensation in high-precision Kibble balances.

C2weakest assumption

The geometric relationships from the equilateral triangle target and the distributed sensor placements accurately determine coil tilts and positions without significant errors from sensor calibration drift, crosstalk, or mechanical mounting tolerances.

C3one line summary

A seven-channel optical measurement system is presented for real-time monitoring of coil parasitic motions (x_c, y_c, θ_x, θ_y) and mass position offsets (x_m, y_m) in the Tsinghua Tabletop Kibble balance using distributed spectrally-confocal sensors.

References

4 extracted · 4 resolved · 0 Pith anchors

[1] The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass, 2016

[2] Design of the Tsinghua tabletop Kibble balance, 2023

[3] The BIPM Kibble balance for realizing the kilogram definition, 2020

[4] Invited Article: A precise instrument to determine the Planck constant, and the future kilogram, 2016

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-05-20T00:03:25.297610Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1e4eeaabebcbfd52b88e26fa9a33e44f0690f6f5e93974a3a2f58aa58cc59837

Aliases

arxiv: 2605.16835 · arxiv_version: 2605.16835v1 · doi: 10.48550/arxiv.2605.16835 · pith_short_12: DZHOVK7LZP6V · pith_short_16: DZHOVK7LZP6VFOEO · pith_short_8: DZHOVK7L

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/DZHOVK7LZP6VFOEOE35JUM7EJ4 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 1e4eeaabebcbfd52b88e26fa9a33e44f0690f6f5e93974a3a2f58aa58cc59837

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2e8a56bcf50dc047a290f310d11b7cd5f33df3b1e4b0e50a2383515e977f484a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ins-det",
    "submitted_at": "2026-05-16T06:37:01Z",
    "title_canon_sha256": "f6d5474e44d7c64f9dcddcb46726fcf243a1e91efce7ae4502abf6e479b95b33"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.16835",
    "kind": "arxiv",
    "version": 1
  }
}