Spirometer is the instrument used to measure lung capacity and volume. The record obtained from spirometer is called a spirogram. There are a number of spirometers used in respiration volume measurements. In this article, we look at general types of … Read More
Dispersive Spectrophotometry Chemical Analysis Technique
Dispersive spectrometry (DS) methods make up a large number of ultraviolet, visible light and infrared spectroscopy systems. DS refers to the fact that the light or electromagnetic radiation passed through the sample (analyte) must pass through a monochromator either before … Read More
Features of Microprocessor-Based ECG Systems
Microprocessors have been used in electrocardiographs to obtain certain advanced features like the elimination of artefacts, baseline shifting, and so forth using software techniques. In this article, we look at some of the key features of microprocessor-based ECG systems … Read More
The Principle & Applications of Confocal Imaging
Confocal imaging (CI) is based on illuminating a single point on the sample and collecting scattered light from the same point of the sample. The illumination point on the sample is the image of the illumination pinhole and is imaged … Read More
3 Common Causes of Anomalies in ECG Recordings
Polarizable vs. Non-Polarizable Electrodes
We may categorize electrodes into two possible types albeit theoretically: those that are perfectly polarizable and those that are perfectly non-polarizable. This categorization is based on what happens to an electrode when a current passes between it and the electrolyte. … Read More
What is Bioinstrumentation?
Bioinstrumentation involves the measurement of current or voltage signals from the different parts of the body. The measurement of various physiological signals produced by the body helps in diagnosis and treatment of diseases. In actual fact, when we talk about … Read More
5 Types of Biomedical Instrumentation Systems
We have the following five types of biomedical instrumentation/measurement systems:
- Direct/Indirect
- Invasive/Non-invasive
- Contact/Remote
- Sense/Actuate
- Dynamic/Static
Direct/Indirect
In biomedical instrumentation we may have the sensing system measuring a physiological parameter directly, such as the average blood flow in an artery or … Read More
Flame Atomic Absorption Spectrometry
When a sample is introduced into a flame, only a small fraction of the atoms are in an excited or high energy state [as per the Boltzmann equation] and most atoms of the element remain in the unexcited or ground … Read More
4 Classifications of Biomedical Measurement Instruments
Instruments that are used in biomedical measurements can be grouped into four categories, based on the following:
- Quantity that is sensed
- Principle of transduction
- Organ system
- Clinical medicine specialities
Classification Based on Quantity that is sensed
The techniques employed in … Read More