QMed Innovations Inc. - Game Changing Medical Device Kit Tracking And Analytics
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The results obtained in laboratory tests, using scintillator bars read by silicon photomultipliers are reported. The current approach is the first step for designing a precision tracking system to be placed inside a free magnetized volume for the cost identification of low energy crossing particles. The devised system is demonstrated ready to provide a spatial resolution better than 2 mm. Scintillators, Photon Solid State detector, particle tracking devices. Among the planned activities was the construction of a light spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The entire design must be optimised for the dedication of the momentum and cost of muons in the 0.5 - 5 GeV/c range (the mis-identification is required to be less than 3% at 0.5 GeV/c). 1.5 mm is required inside the magnetized air quantity. On this paper we report the results obtained with a small array of triangular scintillator bars coupled to silicon photomultiplier (SiPM) with wavelength shifter (WLS) fibers.
This bar profile is here demonstrated able to provide the required spatial decision in reconstructing the position of the crossing particle by profiting of the cost-sharing between adjacent bars readout in analog mode. SiPMs are excellent candidates in replacing normal photomultipliers in many experimental situations. Tests have been performed with laser beam pulses and iTagPro tracker radioactive source in order to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the observed behaviour of the SiPM utilized in our exams relating to the primary sources of noise and the effect of temperature on its response and linearity. Several models and packaging have been considered. The principle supply of noise which limits the SiPM’s single photon resolution is the "dark current" fee. It's originated by charge carriers thermally created in the sensitive quantity and present within the conduction band and subsequently it depends upon the temperature. The dependence of the darkish current single pixel rate as a operate of the temperature has been investigated using Peltier cells so as to vary and keep the temperature controlled.
Dark current charge depends additionally on the Vwk as shown in Fig. 3. In an effort to have low charges of dark present the value of Vbias has been fastened at 1.5 V giving a working voltage Vwk of 29 V. It is obvious that, if vital, it can be convenient to use a bias voltage regulator which automatically compensates for temperature variations. Not at all times the pixels of the SiPM work independently from one another. Photoelectrons (p.e.) can migrate from the hit pixel to a different indirectly fired by a photon. Optical cross-discuss between pixels leads to a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross speak likelihood can be obtained by the ratio double-to-single pulse price as a function of the temperature. The chance relies upon weakly on the temperature and the measured stage of cross-talk (15-16%) is compatible with the one reported within the datasheet. SiPM response once its primary parameters and cells configuration are given.
Within the Fig. 4 it is proven the pulse height distribution of the darkish current for the SiPM underneath test. 0.2) mm diameter hole used to lodge a fiber to collect the sunshine. The lateral surface of the scintillator strips is painted with white EJ-510 TiO2 Eljen paint. The scintillation mild is collected with 1.2 mm BCF-91A WaveLength Shifter (WLS) fiber produced by the Saint-Gobain Ltd. The WLS is glued into the opening operating along the bar and its ends are polished. The read-out is performed by the SiPM only at one end and the opposite side is mirrored with reflecting tape to maximise the sunshine assortment. The front-end board prototype dedicated to the amplification and SiPM readout has been developed by the Bologna INFN digital group. The present from the SiPM is discharged on the low input resistance of the transimpedance amplifier; this offers small time constants, that is, fast signal rise time (using the OPA 656N with a 500 MHz bandwidth we get hold of alerts with 20-30 ns of rise time).