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| Category |
NDIR Sensors |
Touch Sensors |
| Basics |
Density is measured by assessing the optical absorbance of
different types of gases absorbing infrared rays of specific wavelengths |
Density is measure by assessing chemical changes that occur upon coming in contact with gas molecules |
| Types |
Non-dispersive infrared type
Photo-acoustic type |
Semi-conduct type
Solid electrolyte type
Electro-chemical type |
| Difference |
Highly accurate as they detect specific gases and measure accordingly
(CO2 and CO are required to be measured by NDIR sensors) |
Variables such as vapor and other gases prevent accurate measurements |
| Strength |
Longevity, accuracy |
Compact size, low price |
| Weakness |
High price, however, the average price has shown a slight decrease, resulting in the increase in demand |
Short life span, low accuracy |
| Evaluation |
NDIR sensors are replacing existing touch sensors with the decrease in the average price |
