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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.


Sample and hold execution.
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f19-sensors-08-03406: Sample and hold execution.

Mentions: When there are many analogue inputs that are needed to be converted into digital outputs, the sample and hold circuits come in handy. For example, in this paper, there are 32 analogue inputs fed in parallel into the 32 channels DAS buffers. A single digital input control signal from the microcontroller will request all 32 individual sets S/H circuits to sample all the analogue signals synchronously. All the signals on-hold will be sent also in parallel to the DAS for data conversion. This will save execution time whereby all 32 analogue signals need not wait to be sampled in serial, which is sampling the 1st, followed by 2nd signal, 3rd signal until 32nd analogue signals. Figure 19 illustrates an example of the analogue and digitalized S/H output signals for Channel 23.


Hardware Implementation of Multiple Fan Beam Projection Technique in Optical Fibre Process Tomography
Sample and hold execution.
© Copyright Policy
Related In: Results  -  Collection

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

f19-sensors-08-03406: Sample and hold execution.
Mentions: When there are many analogue inputs that are needed to be converted into digital outputs, the sample and hold circuits come in handy. For example, in this paper, there are 32 analogue inputs fed in parallel into the 32 channels DAS buffers. A single digital input control signal from the microcontroller will request all 32 individual sets S/H circuits to sample all the analogue signals synchronously. All the signals on-hold will be sent also in parallel to the DAS for data conversion. This will save execution time whereby all 32 analogue signals need not wait to be sampled in serial, which is sampling the 1st, followed by 2nd signal, 3rd signal until 32nd analogue signals. Figure 19 illustrates an example of the analogue and digitalized S/H output signals for Channel 23.

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.