a. Strong anti-interference ability. Gas sensors must be protected from the ingress of moisture and other interfering gases into the exhaled breath to ensure the accuracy and reliability of the breath analysis.
b. High sensitivity and low detection limit (LOD). Gas sensors must be able to detect low-concentration biomarkers of disease, even at the single-molecular level.
c. High and strong stability. Exposed to the same sample of respiratory gases, gas sensors should have solid results.
d. Fast and real-time diagnosis and short recovery time. It is essential that gas sensors respond quickly to biomarkers and save time compared to bulky equipment (eg GS-MS).
e. Good interaction. Gas metering systems should have a human / computer-friendly interface. The test results should be clear and visible, the test parameters should be adjustable and the operation simple.
f. Reusability, cheapness, small size, easy to use, low operating temperature, easy calibration, and processable output
As non-invasive detection techniques, gas sensors play an important role in respiratory detection. Therefore, a lot of effort has been made to design and manufacture new gas sensors. Interactions between the sensor and the target gas are the basis of the detection process. Sensors can react quickly to even minor changes in VOC concentrations. Electronic nose output includes conduction, color, vibration, and more. Researchers can differentiate between different diseases by analyzing the results of the outputs [10].
a. Strong anti-interference ability.
Gas
sensors
must
be protected
from the ingress of moisture and other interfering gases into the exhaled breath to ensure the accuracy and reliability of the breath analysis.
b. High sensitivity and low
detection
limit (LOD).
Gas
sensors
must
be able to detect low-concentration biomarkers of disease, even at the single-molecular level.
c. High and strong stability. Exposed to the same sample of respiratory gases,
gas
sensors should have solid results.
d.
Fast
and real-time diagnosis and short recovery time. It is essential that
gas
sensors respond
quickly
to biomarkers and save time compared to bulky equipment (
eg
GS-MS).
e.
Good
interaction.
Gas
metering systems should have a human / computer-friendly interface. The
test
results should be
clear
and visible, the
test
parameters should be adjustable and the operation simple.
f. Reusability, cheapness,
small
size, easy to
use
, low operating temperature, easy calibration, and processable output
As non-invasive
detection
techniques,
gas
sensors play an
important
role in respiratory
detection
.
Therefore
,
a lot of
effort has
been made
to design and manufacture new
gas
sensors. Interactions between the sensor and the target
gas
are the basis of the
detection
process. Sensors can react
quickly
to even minor
changes
in VOC concentrations. Electronic nose output includes conduction, color, vibration, and more. Researchers can differentiate between
different
diseases by analyzing the results of the outputs [10].