Avalon Densitometer

A transmission densitometer
that doesn't fight you.

An open-protocol bench densitometer for industrial radiography film, paired with a native calibration application that runs inside the Avalon platform — no proprietary utility, no obsolete drivers, no serial-port roulette.

Avalon Densitometer — isometric
The Hardware

Built to be opened, calibrated, and trusted.

A printed structural housing, a precision plunger, a white-acrylic diffuser plate cut from a known-good DXF, and a USB-C port that talks to anything you connect.

  • Density range — 0.00 to 4.50 D
  • Aperture — 2 mm circular, swappable
  • Diffuser — white acrylic, water-jet cut
  • Drive — stepper-controlled plunger
  • Power — USB-C, no external supply
  • Footprint — 180 mm × 130 mm × 95 mm
Avalon Densitometer — three-quarter
The Software

Calibration that finishes itself.

The Avalon calibration app walks the operator through a step-wedge sweep, captures every reading directly into the platform's database, and prints a signed certificate at the end.

  • Step wedge — guided sweep, automatic averaging
  • Records — Before-Cal and After-Cal columns side by side
  • Storage — every reading on the platform, forever
  • Certificate — generated in line, signed by tech
  • Alerts — calibration-due notifications by email and push
The Protocol

Open, documented, ASCII.

The Avalon densitometer speaks a simple ASCII protocol over USB-C — readable in any serial terminal, scriptable from any language, and documented in full for anyone who wants to integrate it themselves.

CommandDescriptionResponse
READTake a single density readingD=2.345,T=0,STAT=OK
ZEROZero against current aperture positionOK
CAL?nRead calibration coefficient nCAL=n,VALUE=…
CAL=n,vSet calibration coefficient n to vOK
STEP nDrive plunger to step n (0–127)OK
STATUSReturn device status wordSTAT=…,FW=…,SN=…
RESETSoft-reset the controllerOK

Because the protocol is plain ASCII, the densitometer drops in to existing QA workflows without forcing a rewrite — but the matching software is where it really earns its keep.

Specifications

The full sheet.

Measurement typeTransmission, visible-light
Density range0.00 D to 4.50 D
Repeatability±0.02 D typical at 2.50 D
Aperture2 mm round, swappable; 1 mm option
Light sourceStabilized white LED, diffuser-mounted
DetectorPhotodiode with on-board ADC, 16-bit
MechanismStepper-controlled plunger, 200 step/mm
InterfaceUSB-C, CDC-ACM serial class
ProtocolASCII, line-terminated, documented
SoftwareAvalon Calibration App, native to the platform
Operating temperature5 °C to 40 °C, non-condensing
Power5 V via USB-C, < 500 mA peak
Dimensions180 × 130 × 95 mm
Weight~ 850 g
WarrantyOne year, parts and labor

Want one on your bench?

The Avalon densitometer is built to order. Reach out and we'll talk through aperture, step-wedge pairing, and software-only access if you've already got a unit you'd like to drive.

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