Sensors are often compared to the five major human senses:
Photosensitive sensors – vision
Audiosensitive sensors – hearing
Gaseous sensors – smell
Chemical sensors – taste
Pressure-sensitive, temperature-sensitive, and fluid-sensitive sensors – touch
Classification of Sensitive Elements:
Physical: Based on physical effects such as force, heat, light, electricity, magnetism, and sound.
Chemical: Based on the principles of chemical reactions.
Biological: Based on molecular recognition functions such as enzymes, antibodies, and hormones.
Generally, based on their basic sensing functions, sensors can be divided into ten major categories: thermosensitive elements, photosensitive elements, gas sensitive elements, force sensitive elements, magnetic sensitive elements, humidity sensitive elements, acoustic sensitive elements, radiation sensitive elements, color sensitive elements, and taste sensitive elements (some have even classified them into 46 categories).