Droplet sorting device, droplet sorting method and program
There is provided a droplet sorting device including a detector configured to detect a state of droplets ejected from an orifice that generates a fluid stream and of satellite droplets existing between the droplets, and a controller configured to control a frequency of a driving voltage supplied to a vibration element that applies vibration to the orifice on the basis of positions where the satellite droplets exist.
1. A droplet sorting apparatus comprising:
a detection device configured to detect a state of a satellite droplet ejected from an orifice of a flow channel structure; and
a controller configured to control a frequency of a driving voltage supplied to a vibration element based on a position of the satellite droplet, wherein the vibration element is configured to vibrate the flow channel structure, and wherein the controller is further configured to control the frequency of the driving voltage in a manner that the satellite droplet is absorbed in a droplet adjacent to the satellite droplet within a given region from a position where a fluid discharged from the orifice is broken into the droplet and the satellite droplet.
2. The droplet sorting apparatus according to claim 1 , wherein the position of the satellite droplet is a relative position to the droplet adjacent to the satellite droplet.
3. The droplet sorting apparatus according to claim 2 , wherein the detection device comprises:
an image sensor configured to acquire an image of the droplet and the satellite droplet; and
a processor configured to distinguish between the droplet and the satellite droplet based on the image acquired by the image sensor.
4. The droplet sorting apparatus according to claim 3 , wherein the image sensor is arranged to acquire an image of a position where a fluid discharged from the orifice is broken into the droplet and the satellite droplet under two or more conditions of different frequencies of the driving voltage, and wherein the processor is further configured to rank the different frequencies into ranked frequencies based upon a distance between the orifice and a position at which the fluid is broken into the droplet and the satellite droplet.
5. The droplet sorting apparatus according to claim 3 , further comprising a position adjustment mechanism configured to adjust a position of the image sensor.
6. The droplet sorting apparatus according to claim 3 , wherein the detection device is further configured to quantify asymmetry values of the droplet based on the image, and wherein the controller is further configured to control the frequency of the driving voltage in a manner that the quantified asymmetry values fall within a predetermined range.
7. The droplet sorting apparatus according to claim 4 , wherein the controller is further configured to control the frequency of the driving voltage to step through the ranked frequencies and to vary the driving voltage to determine a first frequency for which the position where the fluid is broken into the droplet and the satellite droplet moves toward the orifice as the amplitude of the driving voltage increases.
8. The droplet sorting apparatus according to claim 7 , wherein the controller is further configured to vary the frequency of the driving voltage about the first frequency to determine whether the satellite droplet is absorbed in the droplet.
9. The droplet sorting apparatus according to claim 1 , wherein the frequency of the driving voltage supplied to the vibration element is controlled by detecting a state of the satellite droplet under two or more conditions of different amplitudes of the driving voltage.
10. The droplet sorting apparatus according to claim 9 , wherein the controller is further configured to control the frequency of the driving voltage in a manner that a position where a fluid discharged from the orifice is broken into a droplet and the satellite droplet moves toward the orifice as the amplitude of the driving voltage increases.
11. A droplet sorting apparatus comprising:
an image sensor arranged to acquire an image of a fluid ejected from an orifice at a position where the fluid is broken into droplets and satellite droplets; and
a controller configured to control a frequency of a driving voltage supplied to a vibration element in a manner that a position where the fluid is broken into droplets and satellite droplets moves toward the orifice as an amplitude of the driving voltage increases, wherein the vibration element is configured to vibrate a structure that includes the orifice, and wherein the controller is further configured to control the frequency of the driving voltage in a manner that a satellite droplet is absorbed in a droplet adjacent to the satellite droplet within a given region from a position where a fluid discharged from the orifice is broken into the droplets and the satellite droplets.
12. A droplet sorting method comprising:
detecting a state of a satellite droplet ejected from an orifice of a flow channel structure; and
controlling, with a controller, a frequency of a driving voltage supplied to a vibration element which is configured to vibrate the flow channel structure based on a position of the satellite droplet such that the satellite droplet is absorbed in a droplet adjacent to the satellite droplet within a given region from a position where a fluid discharged from the orifice is broken into the droplet and the satellite droplet.