Time measurement when voltage is below a certain amount

In a project for class I built a pendulum that swings through an infrared emitter to a detector. when somethings cuts the beam from the emitter, the voltage drops to virtually zero. I need to be able to measure how long the voltage was at zero for my project, but can't for the life of me figure out how to do it. I really would appreciate any help!

i'm using a daq device (i'd have to be in class to tell the exact version). I'm reading the voltage on a channel I made, and the voltage bounces from 0V to 1.6V when the beam is cut.
one idea i came up with was to setup a comparison where a caution/stop light would light up whenever the voltage was below 1V, and then have something measure how long that light was on, but I could find a vi that could do that. I'll definitely give that measure pulse width thing a try, cuz I need to hurry up and finish this project already.

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Time measuremen​t when voltage is below a certain amount

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