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Pulsed time-of-flight radar for fiber-optic strain sensing
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View: Figures


Image of FIG. 1.
FIG. 1.

Block diagram of the TOF measurement system.

Image of FIG. 2.
FIG. 2.

Measurement principle.

Image of FIG. 3.
FIG. 3.

Schematic diagram of the constant fraction timing discriminator and a simplified pulse diagram showing the effect of offset voltage on the timing moment.

Image of FIG. 4.
FIG. 4.

Walk error of the TOF measurement system.

Image of FIG. 5.
FIG. 5.

Block diagram of the TDC.

Image of FIG. 6.
FIG. 6.

Drift of the TOF measurement system as a function of time and device temperature.

Image of FIG. 7.
FIG. 7.

Transmission and reflection losses of a sensor fiber.

Image of FIG. 8.
FIG. 8.

Operating principle of the bridge measurement using the TOF measurement device.

Image of FIG. 9.
FIG. 9.

Photographs of the TOF sensor.

Image of FIG. 10.
FIG. 10.

Strain in the bridge deck under traffic loading. TOF measurement curve.

Image of FIG. 11.
FIG. 11.

Thermal elongation of the bridge deck. Measurement curves of TOF and FBG sensors and calculated model.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pulsed time-of-flight radar for fiber-optic strain sensing