OPTICAL FLOW SIMULATORS AND METHODS OF USING THE SAME
An optical flow simulator includes a disk, a stepper motor, and a microcontroller. The disk has a color distribution varied along a path on the disk. The stepper motor is configured to rotate a spindle, and the spindle is coupled to the disk. The microcontroller controls the stepper motor such that the spindle and the disk rotate a predefined rotational velocity. The color distribution produces a simulated optical signal responsive to rotation of the disk and the predefined rotational speed.
1 . An optical flow simulator, comprising:
a disk having a color distribution varied along a path on the disk;
a stepper motor configured to rotate a spindle, the spindle being coupled to the disk;
a microcontroller for controlling the stepper motor such that the spindle and the disk rotate at a predefined rotational speed; and
wherein the color distribution produces an optical signal responsive to rotation of the disk at the predefined rotational speed.
2 . The optical flow simulator of claim 1 , further comprising a frame having a platform for positioning at least one reflective optical sensor directly adjacent to the color distribution of the disk such that the least one reflective optical sensor can measure the simulated optical signal.
3 . The optical flow simulator of claim 1 , wherein the color distribution of the disk is selected according to an algorithm such that the simulated optical signal is substantially similar to a measured optical signal.
4 . The optical flow simulator of claim 3 , wherein the color distribution of the disk comprises a plurality of arc segments, each of the plurality of arc segments having an individual color that is selected according to the algorithm.
5 . The optical flow simulator of 3 , wherein the measured optical signal is a Photoplethysmogram (PPG) waveform obtained from an individual, wherein each period of the PPG waveform measures one heartbeat of the individual.
6 . The optical flow simulator of claim 7 , wherein the simulated optical signal simulates one heartbeat from the PPG waveform for each full revolution of the disk.
7 . The optical flow simulator of claim 7 , wherein (i) at least one reflective optical sensor is fixed directly adjacent to the color distribution and (ii) the predefined rotational speed is selected such that a period of the simulated optical signal simulates a heart rate.
8 . The optical flow simulator of claim 7 , wherein at least one reflective optical sensor is selectively positioned directly adjacent to the color distribution relative to an outer edge thereof such that a period of the simulated optical signal simulates a heart rate.
9 . An optical flow simulator, comprising:
a belt having a color distribution linearly varied along a path, the belt being fitted over a plurality of rollers;
a stepper motor configured to rotate a spindle, the spindle being configured to rotate at least one of the plurality of rollers to move the belt;
a microcontroller for controlling the stepper motor such that the belt moves at a predefined speed; and
wherein the color distribution produces a simulated optical signal responsive to movement of the belt at the predefined speed.
10 . The optical flow simulator of 9 , further comprising a frame having a platform for positioning at least one reflective optical sensor directly adjacent to the color distribution of the belt such that the least one reflective optical sensor can measure the simulated optical signal.
11 . The optical flow simulator of claim 9 , wherein the color distribution of the belt is selected according to an algorithm such that the simulated optical signal is substantially similar to a measured optical signal.
12 . The optical flow simulator of claim 11 , wherein the color distribution of the belt comprises a plurality of arc segments, each of the plurality of arc segments having an individual color that is selected according to the algorithm.
13 . The optical flow simulator of 11 , wherein for each revolution of the belt at the predefined speed, the simulated optical signal is substantially similar to one period of the physically measured optical signal.
14 . The optical flow simulator of 11 , wherein the predefined speed is selected such that a frequency of the simulated optical signal measured by the at least one reflective optical sensor is substantially similar to a frequency of the physically measured optical signal.
15 . An optical flow simulator, comprising:
a semi-translucent disk having an light transmissivity distribution varied along a path on the semi-translucent disk;
a stepper motor configured to rotate a spindle, the spindle being coupled to the semi-translucent disk;
a microcontroller for controlling the stepper motor such that the spindle and the disk rotate at a predefined rotational speed; and
wherein the light transmissivity distribution of the semi-translucent disk produces a simulated optical signal responsive to rotation of the disk at the predefined rotational speed.
16 . The optical flow simulator of 15 , further comprising a frame having a first platform for positioning a photo transmitter of a transmissive optical sensor directly adjacent to a first surface of the semi-translucent disk and a second platform for positioning a photo-receiver of the transmissive optical sensor directly adjacent to a second surface of the semi-translucent disk such that the transmissive optical sensor can measure the simulated optical signal.
17 . The optical flow simulator of 15 , wherein the light transmissivity distribution is selected according to an algorithm such that the simulated optical signal corresponds to a physically measured optical signal.
18 . The optical flow simulator of claim 17 , wherein the light transmissivity distribution of the semi-translucent disk comprises a plurality of segments, each of the plurality of segments having a light transmissivity that is selected according to the algorithm.
19 . The optical flow simulator of 17 , wherein for each revolution of the semi-translucent disk at the predefined rotational speed, the simulated optical signal is substantially similar to one period of the physically measured optical signal.
20 . The optical flow simulator of 17 , wherein (i) at least one transmissive optical sensor is positioned at a fixed location directly adjacent to the light transmissivity distribution of the disk and (ii) the predefined rotational speed is selected such that a frequency of the simulated optical signal measured by the at least one transmissive optical sensor is substantially similar to a frequency of the physically measured optical signal.
21 . The optical flow simulator of 17 , wherein at least one transmissive optical sensor is selectively positioned directly adjacent to the light transmissivity distribution of the semi-translucent disk relative to an outer edge thereof such that a frequency of the simulated optical signal measured by the at least one transmissive optical sensor is substantially similar to a frequency of the physically measured optical signal.
22 - 25 . (canceled)