Table of Contents
µCT
X-Ray Source
PSX10-WB-130 Microfocus Source
- 20kV-130kV targe voltage
- 0.356mA@45kV 0.123mA@130kV beam current
- 7µm@4W - 21µm@16W focal spot on tungsten target
- 115° cone angle
- 0.51mm Beryllium window
PXS5-724EA Microfocus Source
- 20kV-70kV targe voltage
- 0-0.1 mA beam current
- 10µm x 10µm focal spot on tungsten target
- 34° (or 40°) cone angle
- 0.13mm Beryllium windows
Connector
- Chassis Ground
- 4.0V DC kV Control Source
- HV Programming (4.0V = 80kV)
- HV Programming Ground
- Current Programming (2.5V = 100µA)
- Standby Power (+12V DC)
- HV Monitor Voltage (4.0V = 80kV)
- Current Monitor (2.5V = 100µA)
- Monitor Ground
- +2.5V DC mA Control Source
- +12 DC Operate Power
- DC Operate Ground
Mating Connector :
- Backshell: TE 206322-9 (https://www.digikey.de/product-detail/de/206322-9/A33767-ND/1124058/?itemSeq=355818490)
Thoshiba DGO 73
- 65kV
- 8mA beam current
- 700µm x 700µm focal spot
- 2mm Aluminium filter (integrated in tube?)
X-Ray Detector
FDXD-1417
Dexis Platinum / GXS-700
- SN: 0104430711
- 19.5µm x 19.5µm Pixels
- 1324×1692 Resolution
- Sensor Firmware Version: 0.5.10, 0.3.6, 0.4.5
- CPLD Version: 3.3.0.0
- API Version: 1.0.10.0
- VID 5328 PID 2010
- SN: 1093330312
- 19.5µm x 19.5µm Pixels
- 1552×1040 Resolution
https://nucwiki.org/wiki/index.php/GXS700_FOSS
https://nucwiki.org/wiki/index.php/Gendex_GXS700
DigiPan
- 1244 x 61 pixels
- 104µm pixel pitch
- 12bits per pixel
- 1 Start bit, 1 Control bit (always 1)
https://hackaday.io/project/62710-taking-digital-xray-shots-for-cheap-300
Connector
- (BL) Ground
- (RD) +5V
- (OR) +15V
- (GR) -15V
- (BL) RS422 A
- (WH) RS422 B
Power Supply
- 5V (2A)
- +/- 15V (700mA)
Protocol
- 8MHz UART, 1 Start bit, No Stop bit
- ADC Data is 12bit + 1 control (seems to be always 1)
- Data is streamed out pixel by pixel, line by line, 1244x 13 bit data packets per CCD line
Flatpanel Detector
Fluorescent Screen
Mechanics
Stepper Motors
GRBL
https://github.com/gnea/grbl/wiki/Grbl-v1.1-Configuration
http://eleccelerator.com/fusecalc/fusecalc.php?chip=atmega2560
Settings
M1: /dev/USB1
- $0=10
- $1=25
- $2=0
- $3=2
- $4=0
- $5=0
- $6=0
- $10=1
- $11=0.010
- $12=0.002
- $13=0
- $20=1
- $21=0
- $22=1
- $23=7
- $24=500.000
- $25=500.000
- $26=250
- $27=1.000
- $30=1000
- $31=0
- $32=0
- $100=25.000
- $101=200.000
- $102=200.000
- $103=250.000
- $110=1000.000
- $111=500.000
- $112=500.000
- $113=500.000
- $120=20.000
- $121=30.000
- $122=10.000
- $123=10.000
- $130=125.000
- $131=155.000
- $132=150.000
- $133=200.000
M2: /dev/USB2
- $0=10
- $1=100
- $2=0
- $3=0
- $4=0
- $5=0
- $6=0
- $10=1
- $11=0.020
- $12=0.002
- $13=0
- $20=1
- $21=0
- $22=1
- $23=1
- $24=250.000
- $25=1000.000
- $26=250
- $27=1.000
- $30=12000
- $31=0
- $32=0
- $100=10.000
- $101=10.000
- $102=250.000
- $103=250.000
- $110=1000.000
- $111=1000.000
- $112=500.000
- $113=500.000
- $120=100.000
- $121=100.000
- $122=10.000
- $123=10.000
- $130=165.000
- $131=175.000
- $132=200.000
- $133=200.000
Limit Switches
- GND - Schwarz
- VCC - Braun
- SIG - Blau
A4988
Step Mode
| MS1 | MS2 | MS3 | Mode |
|---|---|---|---|
| GND | GND | GND | 1/1 |
| VIO | GND | GND | 1/2 |
| GND | VIO | GND | 1/4 |
| VIO | VIO | GND | 1/8 |
| VIO | VIO | VIO | 1/16 |
Current Limit
Current Limit = Vref x 2.5V/A
TMC2208
Step Mode
| MS1 | MS2 | Mode |
|---|---|---|
| GND | VIO | 1/2 |
| VIO | GND | 1/4 |
| GND | VIO | 1/8 |
| VIO | GND | 1/16 |
Current Limiting
The best way to set the motor current is by measuring the voltage on the Vref pin (0…2.5V) and adjusting the voltage with the potentiometer. The maximum settable motor current is 1.77A RMS (0.11Ohm sense resistors), but the SilentStepSticks can only be used up to 1.2A RMS.
Irms = (Vref * 1.77A) / 2.5V = Vref * 0.71
Vref = (Irms * 2.5V) / 1.77A = Irms * 1.41 = Imax
Vref → Voltage on Vref pin (Measure on Wiper of Potentiometer)
Irms → RMS (Root Mean Square) current per phase (Irms = Imax / 1.41)
Imax → Maximum current per phase (Imax = Irms * 1.41)
Rotary Stage
- 0.1° minimum resolution
- AMS AS5147 Magnetic Encoder (On Axis) Datasheet
- Wormgear drive (AliExpress
- 29.5mm Center Distance
- ~50mm gear diameter
Source & Detector
- Distances must be known
- Source - Center of Rotation (SOD - Source Object Distance)
- Center of Rotation - Detector (ODD - Object Detector Distance)
- Source - Detector (SDD - Source Detector Distance)
Reconstruction
Correction
Convert x-ray images to projections:
p(s) = -ln(I(s) / I(0))
p(s) : Projected Intensity I(s) : Intensity recorded at detector after passing through an object I(0) : Intensity at source (white reference)