Device to meter fluid

摘要

An apparatus for metering the delivery of a fluid. The apparatus has a variable acoustic source and a microphone, both acoustically coupled to a volume having a fluid region and an air region. The apparatus may also include a processor to determine a volume of the air region based on signals received from the microphone and the variable acoustic source. A fluid valve is coupled to the processor, and is configured to allow an amount of fluid to exit the fluid region associated with the volume of the air region.

主权项

1. A device to meter fluid comprising:
a fluid reservoir; an acoustic volume sensor including:
a housing containing a first volume and a second volume, the second volume including an air region, and a fluid region, anda printed circuit board disposed within the housing, the printed circuit board defining the first volume within the housing and the printed circuit board including:
an acoustic source,a first microphone acoustically coupled to the first volume, anda second microphone acoustically coupled to the air region; an input valve in fluid communication with the fluid reservoir and configured to allow fluid to enter the fluid region; and a processor in communication with the acoustic volume sensor and configured to meter fluid output from the device.