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Understanding Breathalyser Technology
Infrared vs. fuel cell sensor breathalysers are two of the most common types of devices used to measure blood alcohol concentration (BAC). Both operate on different scientific principles, offering distinct advantages depending on the intended use. Understanding the differences between these breathalyser sensor technologies helps individuals and organisations choose the most suitable option for accurate alcohol detection.
How Infrared Sensor Breathalysers Work
Infrared sensor breathalysers measure alcohol content by detecting how much infrared light is a breath sample absorbs. Alcohol molecules absorb specific wavelengths of infrared radiation, and the degree of absorption correlates with BAC levels. This method is commonly used in high-precision settings, such as law enforcement and forensic analysis.
Advantages of Infrared Sensor Breathalysers
High Accuracy: Infrared technology provides precise readings, making it ideal for evidential testing.
Stable Calibration: These breathalysers require less frequent recalibration compared to other types.
Non-Consumable Sensors: Unlike fuel cell sensors, infrared sensors do not degrade over time.
How Fuel Cell Sensor Breathalysers Work
Fuel cell breathalysers operate through an electrochemical reaction. When alcohol in the breath interacts with the fuel cell, it generates an electrical current proportional to the BAC level. This technology is widely used in personal and workplace testing due to its portability and reliability.
Advantages of Fuel Cell Sensor Breathalysers
Selective Sensitivity: Fuel cell sensors react specifically to ethanol, reducing false positives from substances like acetone.
Portability: These breathalysers are compact and commonly used for roadside and workplace testing.
Cost-Effective: Fuel cell devices are generally more affordable for frequent testing applications.
Choosing the Right Breathalyser
The choice between infrared and fuel cell breathalysers depends on the application. Infrared technology is preferred for legal and forensic use due to its high accuracy, while fuel cell breathalysers offer a practical solution for personal and workplace testing. Understanding the science behind these sensors helps users select the most suitable breathalyser for their needs.
Sources:
National Institute on Alcohol Abuse and Alcoholism
