Non – invasive Fetal Scalp pH Measurement Utilizing Magnetic Induction Spectroscopy Technique

Abstract

Conventional fetal of fetal scalp sampling needs an invasive method to acquire blood sample to the fetus. In this paper describes a suggested non-invasive technique employing magnetic induction spectroscopy based on hydrogen conductivity in pH solution. Four types of transmitter-receiver (Tx-Rx) coil pairs are developed and test with frequency range from 2MHz to 10MHz. The phase reading from both reference channel, and sample channel is taken and the phase change is calculated from the differences between both channels. The result shows that the phase is decreased as the pH value of the solution increase. Circular pair of Tx-Rx shows a good sensitivity reading while square pair Tx-Rx shows a linearity result. From the result obtained, it is proved that single channel magnetic induction spectroscopy can be used as a non-invasive pH meter as an alternative to invasive pH meter.