Radiation Hardening Fiber Optic Plate(rhFOP)

  • Protect Sensor from Radiation Damage
  • Resistance to Xray Browning (Turning brown after long-term use)
  • Absorb scattering light generated by phosphor

rhFOP are made from material that can absorb Xray energy. It will protect the sensor from the excessive Xray leak from phosphor (scintillator). Which will improve lifetime of sensor, and also increase the SNR of the system.
*rhFOP are cerium doped by default

  • Xray Shielding Fiber Optic Plate

The specification below is referred to the production possibility with a certain type of material.
You can customize the rhFOP with specification mentioned below.

wdt_ID Attributes Values Notes
1 Single Fiber diameter 4um / 6um / 12um Smaller fiber size means higher resolution. ( 6um = 114um )
5 Maximum Size 140mm x 140mm Production cost will increase sharply once diagonal surpass 130mm. If you need a bigger size,
6 Thickness 1mm - 10mm With a larger size of FOP, the minimum thickness required will also go up in order to maintain the structure. Usually thickness will go around 1mm - 3mm.
8 EMA Absorber Interstitial EMA are special fibers insert in-between the standard fibers. They are using to absorb stray light between fibers. But at a cost of lowering the overall transmission
9 Numerical Aperture 0.8 Numerical Aperture are decided by the material using to produce the FOP
41 Xray Shielding Ability 93% Thickness: 1.2mm, X-Ray Power 140KVp.
42 Phosphor Compaitable Yes -
43 Lead Free Yes There's no element Pb in the raw material

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Using FOP with Scintillator:

CsI(Tl) has a primarily columnar crystal structure as seen in Figure below) and, depending on the conditions, approximately 83% is reflected within the columnar crystal.

For this reason, light is guided into the crystal wall and a certain fraction is guided into the photodiode direction. These are referred to as structured scintillators. CsI (Tl) scintillator can be deposited on substrates such as glass, which is then flipped and adhered to the photodiode. It can also be deposited directly on the photodiode or deposited on the fiber optic plate. (See Below)

Phosphor Scattering:

While light travelling within the phosphor, the light will spread—the amount of diffusion being proportional to the path length required to escape the phosphor. X rays interacting close to the photodetector give rise to a sharper (less blurred) optical signal than those which interact more distantly. The paths of most optical quanta will be shortest if the photodetector is placed on the x-ray entrance side of the phosphor.

Fiber optic plate can and directly coupling to CCD/CMOS and absorb scattering light that may blur the image.  Which will improve the SNR of the system.

The FOP with radiation hardening processing does not degrade after 20,000Gy exposure.

Accumulated dose: 20000 Gy
Test Conditions: 160Kev, 1mA
FOP Thickness: 2mm

Terms Definition Reference
Fiber Diameter (Pitch) Diameter of a fiber strand / Distance between fiber centering -
Numerical Aperture The numerical aperture, or NA, defines the angle of acceptance—beyond which light is lost out the sides of the fiber. The greater the NA of the fiber, the better the light transmission of the fiber. The larger the N·A is, the greater of luminous flux will be entering the fiber-optic image element
Resolution A detail resolution capability of the optical system to the transferred image The higher the resolution is, the stronger the ability of distinguish image details will be.
EMA In addition to the mono fiber elements, a second fiber is used in the construction of the multi fiber. Extra-mural absorption (EMA)fibers are special black absorbing fibers, inserted between (or in place of) mono fibers, which will absorb stray (scat-tered) light in the fiber optic material.
Core The transmitting qlass in a fiber optic wave guide. The core has a higher index of refraction than the cladding. -
Cladding The outer layer of glass in a fiber optic wave quide. The claddinc has a lower index of refractior than the core. -
Packing Fraction The packing fraction is defined as the ratio of core area to total area in the cross section of a fiber. -
Transmission Transmission are used to quantitatively describe the optical fiber's light transmission capacity, which is the ratio of the outgoing luminous flux to the incoming luminous flux. The greater the transmittance is, the clearer the imaging will be obtained

wdt_ID SKU Dimension (mm) Thickness (mm) Numerical Aperture Fiber Diameter (um)
1 rhfop1 25.4x25.4 2 1.00 6.00
58 rhfop2 17.7x20 10 1.00 4.00
59 rhfop3 17.7x20 10 0.15 4.00
60 rhfop4 25x25 2 1.00 6.00
61 rhfop5 D25 2 1.00 6.00
62 rhfop6 23.1x23.1 11 0.15 4.00
66 rhfop10 23.1x23.1 15 1.00 4.00
67 rhfop11 118x118 6 1.00 6.00
71 elrhfop1 480 x 210 15 0.80 6.00
72 elrhfop2 480 x 210 15 0.80 10.00
73 elrhfop3 480 x 210 15 0.80 10.00
74 elrhfop4 147 x 126 3 1.00 10.00
75 elrhfop5 144.2x123 3 1.00 6.00
76 elrhfop6 50 x 50 3 1.00 6.00
77 elrhfop7 147.5. x 115.0 4 1.00 8.00

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