Theses and Dissertations

Permanent URI for this collection

https://ir.oauife.edu.ng/handle/123456789/313
Theses and Dissertations (Electrical and Electronics Engineering)

Browse

Browsing Theses and Dissertations by Author "Kehinde, L. O."

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Open Access
    Design and Construction of an Electronic Heart Beat Monitor.
    (Obafemi Awolowo University, 1986) Oladunjoye, Olunu Akintunde; Kehinde, L. O.
    The design of safe monitors of physiological events in humans is of paramount importance in the field of medical electronics, and this report describes the development of a safe computer-based heart beat monitor for hospital use. The heart beats are detected by passing light through a finger into a photo-diode. Each time the heart beats, it pumps blood round the body and this causes the density of many parts of the body to vary, particularly the finger tips. By passing light through the finger tip onto a photodiode, this variation in density is converted into electrical signal that varies with the heart beat. The output of the photodiode is amplified in detection and amplification circuit to produce a CMOS compatible pulse each time the heart beats. An electronic method that does not employ a computer is first designed as a basis for comparison with the computer based method. In this method the time interval between successive three heart beats is measured and on the basis of the measured interval, the heart rate is computed by employing digital division method. This method, like others employing digital division method in computing the heart rate, has a reliable narrow operating frequency from 40 to 200 BPM, and a resolution of IBPM. Its main problem arises from truncation error. In the computer based method, the heart beat detection and amplification circuit is interfaced with a digital micro-computer. The microcomputer is programmed to measure the time interval between successive three heart beats, to compute the heart beat rate and to provide both graphical and numerical indications of the heart beat rate. This method has a wide operating range (10 to 10920 BPM), and a resolution less than BPM.
  • Thumbnail Image
    Item
    Open Access
    Development of a Synchronous Data Transmission System.
    (Obafemi Awolowo University, 1986) Agomo, Uchenna Udochukwu; Kehinde, L. O.
    The development of a 2 - channel synchronous data transmission system is presented. The system is capable of accepting at the input two separate analog voltage signals that have zero to 1 kHz frequency range and amplitude not greater than 2.5 volts. The two analog voltage signals are multiplexed at the input of the-system and converted to corresponding digital representations. These digital representations are then transmitted by means of digital gates from the transmitting section serially and with transmission clock frequency of 6.6 MHz, through cable wire to a remote receiving section, where the received digital representations are re-converted to analog voltage signals and demultiplexed to produce at the output, two separate analog voltage signals plus noise. The noise level does not exceed 5% of the signal level when filtered and leaves analog voltage signals with the same characteristics as those at the input of the system. The designed system is simple and can be used for laboratory demonstration on synchronous data transmission system. It may be useful as a communication medium for data exchange between two data processing terminals. The system may be used to transmit voltage signals from a central storage facility to a remote destination. In such circumstance the signals may be those derived from research results, medical findings and student/staff records. A computer base may then be set up and made accessible to users.