Experimental Study on Brush-Painted Passive RFID-Based Humidity Sensors Embedded into Plywood Structures

Table 2

Results of moisture absorption: mean change in mass and standard deviation after each testing time.

	Time	After 100% RH Δm; (%) mean	After 100% RH Δm; (%) st. dev.	After 9 days Δm; (%) mean	After 9 days Δm; (%) st. dev.
Noncoated	5 min	20.51	0	0.39	0
	1 h	46.08	0	0.44	0
IC-coated	5 min	22.66	0.08	0.46	0.03
	1 h	37.56	1.74	0.47	0.13
All-coated	5 min	14.90	6.60	0.19	0.13
	1 h	31.22	5.92	0.47	0.05