Biological Amplifiers and Types of Biological Amplifiers

Why is Bio Amplifier Required? Generally, biological/bioelectric signals have low amplitude and low frequency. Therefore, to increase the amplitude level of biosignals amplifiers are designed. The outputs from these amplifiers are used for further analysis and they appear as ECG, EMG, or any bioelectric waveforms. Such amplifiers are defined as Bio Amplifiers or Biomedical Amplifiers. … Read more

Biomedical Transducers Types of Biomedical Transducers

Non-electrical parameters such as temperature, heart sound, blood pressure are measured from the human body with electronic equipment. Transducers are the devices that convert biological parameters to electrical signals. The process of conversion is Transduction. Generally, transducers convert one form of energy into another form of energy. Transducers are of two types. 1. Active Transducers: … Read more

Application of Transducers in Biomedical Instrumentation

Application of Piezoelectric Transducer Crystal microphone measures and records the Heart sounds (Phonocardiography). The microphone operates in the flat frequency range of 20 to 1000 Hz, which suppresses the breathing sounds and room noise. Sounds from heart chambers are measured with Catheter-tip piezoelectric sensors. A piezoelectric crystal detects the Korotkoff sounds during systolic and diastolic … Read more

Chopper Amplifier for Biomedical Instrumentation

When recording biopotentials noise and drift are the two problems encountered. Noise is due to the recording device and by the patient when they move. Drift is a shift in baseline created due to various thermal effects. A DC amplifier has a shift or sudden peak in the output when the input is zero. Therefore, … Read more

Applications of Resistive Transducers in Biomedical Instrumentation

Applications of Resistive Potentiometer Caliper Myograph It measures change in displacement at various applications. One such application is to detect the changes in the chest (Thoracic) circumference. It operates by connecting a rotary potentiometer to a chest band on a person. In this setup, the transducer acts as a pivot to the caliper arms. They … Read more