3.2 Electromagnetism Analysis of Physical Anti-Collision …
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Fig. 3.10 Connection between the tag’s reading distance and the humidity under static conditions
The constant humidity moving experiment detection system is shown in Fig. 3.11.
The humidity test chamber is suitable for measuring and controlling environmental
humidity. The system simulates the effect of humidity on the UHF RFID tag’s reading
properly. Figure 3.11a shows the schematic of the humidity test chamber, Fig. 3.11b
shows the schematic of the moving experiment system, Fig. 3.11c shows a physical
diagram of the humidity experiment box, Fig. 3.11d shows the hardware structure of
a humidity-control system, Fig. 3.11e shows the structure of the humidity experiment
box.
The test chamber’s inner wall affixed the RFID tag. As the dielectric constant
is very low, the tag recognition rate affected by plastic boxes can be ignored. The
humidity probe is suspended in the test chamber. Some heaters and humidifiers,
connected to a humidity controller outside the test chamber, are placed on the bottom
of the test chamber.
We set the experimental humidity in the humidity controller. The heater and the
humidifier control the surrounding humidity inside the test chamber. The humidity
controller will stop the heater and humidifier’s power supply, if the humidity in the
test chamber reaches the set value.
The hardware of the system consists of these parts. We choose HTC-201 humidity
controller as the humidity controller, HT211 humidity probe as the humidity probe,
JRD type aluminum alloy heating sheet as the dehumidifier, ultrasonic humidifier as
the humidifier.
RFID tags can be affixed to the surface of the cargo when it is received at the
port, where ambient humidity changes greatly. Due to the reliability of RFID tags,
a lot of information can be stored in the tags such as product shipping information
77
Fig. 3.10 Connection between the tag’s reading distance and the humidity under static conditions
The constant humidity moving experiment detection system is shown in Fig. 3.11.
The humidity test chamber is suitable for measuring and controlling environmental
humidity. The system simulates the effect of humidity on the UHF RFID tag’s reading
properly. Figure 3.11a shows the schematic of the humidity test chamber, Fig. 3.11b
shows the schematic of the moving experiment system, Fig. 3.11c shows a physical
diagram of the humidity experiment box, Fig. 3.11d shows the hardware structure of
a humidity-control system, Fig. 3.11e shows the structure of the humidity experiment
box.
The test chamber’s inner wall affixed the RFID tag. As the dielectric constant
is very low, the tag recognition rate affected by plastic boxes can be ignored. The
humidity probe is suspended in the test chamber. Some heaters and humidifiers,
connected to a humidity controller outside the test chamber, are placed on the bottom
of the test chamber.
We set the experimental humidity in the humidity controller. The heater and the
humidifier control the surrounding humidity inside the test chamber. The humidity
controller will stop the heater and humidifier’s power supply, if the humidity in the
test chamber reaches the set value.
The hardware of the system consists of these parts. We choose HTC-201 humidity
controller as the humidity controller, HT211 humidity probe as the humidity probe,
JRD type aluminum alloy heating sheet as the dehumidifier, ultrasonic humidifier as
the humidifier.
RFID tags can be affixed to the surface of the cargo when it is received at the
port, where ambient humidity changes greatly. Due to the reliability of RFID tags,
a lot of information can be stored in the tags such as product shipping information