DFREC — Digital Forensic Research & Expertise CenterForensic Psychology

03 · Forensic polygraph

Parakh

Axxonet's forensic polygraph. Seven channels of physiology, two cameras and every question, recorded on one clock.

InputRespiration · blood pressure · EDA · PPG · movement
SyncEvent-marked questions + front and side video
OutputCharts, measurements, report

02 · The basis · Physiology

The body answers before the mouth does.

The autonomic nervous system adjusts breathing, blood pressure, sweat-gland activity and pulse without conscious control. A polygraph records those adjustments against each question.

RespirationRate, depth, pauses
CardiovascularBlood pressure and pulse volume
ElectrodermalSkin conductance from sweat glands

03 · The instrument · 7 channels

Seven sensors. Two cameras. One record.

Every channel is sampled on the same clock as the question markers and the video, so a reaction can be read against the exact word that caused it.

VideoFront + side cameras with audio · USB or IP
Upgrade pathECG · BCG · 2-channel EEG
  1. P1Thoracic respirationPneumo sensor
  2. P2Abdominal respirationPneumo sensor
  3. BPBlood pressureCuff with pump
  4. EDAElectrodermal activityGSR electrodes
  5. PPGPlethysmographFinger sensor
  6. MV1MovementHand or foot
  7. MV2MovementSeat sensor

04 · The software · Examiner's desk

From questionnaire to report.

Subject records, question sets, live charts, automatic measurement and report templates in one application. Data exports in common formats for independent review.

  1. 01Subject databaseIdentity, background, history
  2. 02Question formatsFour or more · copy sets between files
  3. 03Event markersQuestion timing on the chart
  4. 04Dynamic displayStacked or single tracing · annotations
  5. 05Auto measurementPer question, per channel
  6. 06Reports & exportTemplates · open formats

05 · Live chart

What the examiner sees.

Seven tracings scroll in real time. Each question drops a marker; the software measures the response window that follows.

MarkerQuestion onset and answer, on every channel
WindowAutomatic measurement after each question

06 · Made by Axxonet

Designed and built in Bengaluru.

Axxonet has manufactured EEG, ERP, PSG, neurofeedback and polygraph systems for two decades. Parakh is engineered, assembled and supported in India.

In serviceState forensic science laboratories
Since2000 · Integrity First
7Channels
+3Upgrade channels · ECG, BCG, EEG
2Synchronised cameras
36Months warranty
>50%Local content · Make in India
ISO9001:2015 with design · TÜV SÜD