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Hardware Implementation of Multiple Fan Beam Projection Technique in Optical Fibre Process Tomography

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ABSTRACT

The main objective of this project is to implement the multiple fan beam projection technique using optical fibre sensors with the aim to achieve a high data acquisition rate. Multiple fan beam projection technique here is defined as allowing more than one emitter to transmit light at the same time using the switch-mode fan beam method. For the thirty-two pairs of sensors used, the 2-projection technique and 4-projection technique are being investigated. Sixteen sets of projections will complete one frame of light emission for the 2-projection technique while eight sets of projection will complete one frame of light emission for the 4-projection technique. In order to facilitate data acquisition process, PIC microcontroller and the sample and hold circuit are being used. This paper summarizes the hardware configuration and design for this project.

No MeSH data available.


Binary counter and decoder circuit.
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f14-sensors-08-03406: Binary counter and decoder circuit.

Mentions: CLK is the heartbeat to the signal control circuit and is connected to the 74HC161 binary counter while IR_ON will determine the duration of 74HC154 decoder to activate its output to control the light projection circuit. Since the outputs of the 74HC154 have active low outputs [16], the 74HC04 Inverters is being used to toggle the decoder outputs from low to high before connecting to the base of transistors Qn in the infrared projection circuits. The 74HC04 has six independent inverters [18] and since there are sixteen outputs for the decoder, a total of three inverter chips are needed. The basic connection circuit for the binary counter and the decoder is exemplified in Figure 14.


Hardware Implementation of Multiple Fan Beam Projection Technique in Optical Fibre Process Tomography
Binary counter and decoder circuit.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3675551&req=5

f14-sensors-08-03406: Binary counter and decoder circuit.
Mentions: CLK is the heartbeat to the signal control circuit and is connected to the 74HC161 binary counter while IR_ON will determine the duration of 74HC154 decoder to activate its output to control the light projection circuit. Since the outputs of the 74HC154 have active low outputs [16], the 74HC04 Inverters is being used to toggle the decoder outputs from low to high before connecting to the base of transistors Qn in the infrared projection circuits. The 74HC04 has six independent inverters [18] and since there are sixteen outputs for the decoder, a total of three inverter chips are needed. The basic connection circuit for the binary counter and the decoder is exemplified in Figure 14.

View Article: PubMed Central

ABSTRACT

The main objective of this project is to implement the multiple fan beam projection technique using optical fibre sensors with the aim to achieve a high data acquisition rate. Multiple fan beam projection technique here is defined as allowing more than one emitter to transmit light at the same time using the switch-mode fan beam method. For the thirty-two pairs of sensors used, the 2-projection technique and 4-projection technique are being investigated. Sixteen sets of projections will complete one frame of light emission for the 2-projection technique while eight sets of projection will complete one frame of light emission for the 4-projection technique. In order to facilitate data acquisition process, PIC microcontroller and the sample and hold circuit are being used. This paper summarizes the hardware configuration and design for this project.

No MeSH data available.