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How to measure the amount of liquid water in a thin tube (like a syringe)

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ahbushnell:
Metalize the outside of the tube that is a dielectric.  Then measure the capacitance between the liquid and the metal. 

Andy

ahbushnell:

--- Quote from: ahbushnell on June 18, 2020, 07:11:22 pm ---Metalize the outside of the tube that is a dielectric.  Then measure the capacitance between the liquid and the metal. 

Andy

--- End quote ---

https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=HPC052&DocType=DS&DocLang=English

They measure capacitance in this relative humidity sensor using an oscillator that changes with capacitance. 

bson:
You could fill a small glass pipe with a column a water and drop a small float on top, then use a camera to record the position of the float.  If you set the camera to take an image every few minutes you have a record of its position over the day.  Extracting the position of the float from an image shouldn't be difficult.  Maybe calibrate for solution expansion with temperature.

pickle9000:
Use a peristaltic pump to maintain a level in the tube. The level sensor could be whatever you want. The pump would do the measurement. I'm not sure about how the birds would feel about the pump maintaining the level but the pump would need to be mounted far enough away to keep the noise down but it would allow the accuracy you are looking for.

Mechatrommer:
or you can connect the tube to adjacent large tank reservoir (both open air system) tube's height is adjusted accordingly to get the level to the tip, and then it will take many humming birds to reduce the level slightly. needs no electrical parts.

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