QCLAS and CRDS-Based CO Quantification as Aimed at in Breath Measurements

Table 1

Carbon monoxide amount fraction results based on pulsed QCLAS, cw-QCLAS, and CRDS (CALOS setup) compared to the gravimetric reference value; expanded uncertainties with 𝑘=2.

	𝑥CO/μmol/mol	U(𝑥CO)/μmol/mol	*D/μmol/mol	^#U(D)/μmol/mol
Grav. reference	99.88	0.68	—	—
Intrapulse QCLAS	93.7	9.0	−6.18	9.03
cw-QCLAS	96.8	4.8	−3.08	4.85
CRDS (CALOS setup)	97.7	5.2	−2.18	5.24

* 𝐷=𝑥_CO−𝑥_CO,grav.
^#𝑈(𝐷)=(𝑈²(𝑥_CO)+𝑈²(𝑥_CO,grav))^1/2.