term1 ultrasonic levitating tool

I considered maybe I can use the air to hang the Nostoc bacteria in the cave. I studied the working principle of the ultrasonic levitator and designed an ultrasonic levitating tool to levitate the very little nostoc in the air. The ultrasonic frequency is 100KHz. So the biggest diameter of things which can be levitated is 1.4mm. Also, it has light sensors, if the light sensor can not sense light for 24 hours, it will control the piercing tool to bore a hole on the roof of the cave, and make the light come into the cave. Hence, the Nostoc bacteria can undertaking its photosynthesis.


With the photosynthesis, the crystal will grow around the Nostoc bacteria. Those crystals will also be levitated if they are small, and the suspended crystal can form something like cloud. When the stalactite and nostoc grow larger than the max diameter, those will drop down and like rain.

I considered maybe this system can form climate change phenomenon in the cave.

term1 ultrasonic levitator

The ultrasonic levitator use the ultrasonic wave to levitate single particles or droplets. It suspends the levitated object contactlessly in a fixed position.

As a result of multiple reflections between an ultrasonic radiator and a solid, flat or concave reflector - which is adjusted concentrically at a distance of some multiple half wavelengths - a standing wave with equally spaced nodes and anti nodes of the sound pressure and velocity amplitude will be generated. Solid or liquid samples with effective diameters of less than half a wavelength will be levitated without contact below the pressure nodes as a result of axial radiation pressure and radial Bernoulli stress.

The ultrasonic levitator consists of the reflector flange with integrated concave reflector and a micrometer screw for the variation of the reflector distance, and the transducer flange with integrated ultrasonic transducer, shielding tube and round socket. Generally, it has a micrometer adjustment screw, a piezoelectric sensor connector, a piezoelectric sensor, a reflector, an ultrasound transducer, an absorber and a HF-connector.

Some key points:
1. The distance of the radiator and reflector is some multiple half wavelengths.
2. Solid or liquid samples with effective diameters of less than half a wavelength will be levitated.
3. The self-excitation of sample oscillations can be prevented by tilting the levitator axis by approximately 10-15 degree.
4. The levitator should be mounted on a base plate.
5. Increase reflector distance about 0.2mm above the optimum, in order to avoid possible self-excitation of sample oscillations.

term1 light trace fossil

As we know, the relatively humidity level in the stalactite cave is usually close to 100%. So, there are lots of water droplets which contained Carbonate ion and Bicarbonate radical ion in the cave's air. I used the property of Nostoc bacteria to fossil the light trace.

At first, I used a fiber structure to hold the Nostoc Calcicola and hang it in the cave. While the light come into the cave from a small hole, the crystal will grow around the bacteria under the sunlight more than other area. During the whole day, different time have different light direction. So, the crystal will grow with the light trace on the fiber structure. Long time later, the light trace crystal will appear on the structure, just like fossil the light trace.

term1 nostoc calcicola breb

The Nostoc Calcicola is a kind of cyanobacteria. It can be found in some stalactite caves. This kind of bacteria can accelerate the precipitation of Calcium Carbonate while its photosynthesis.

I think maybe I can use this bacteria as material to form some thing interesting in the cave.

term1 system1

I design a system which can control the direction of stalactite products and accelerate the crystallization process. It use the absorb network to absorb the waterdroplets on the roof of the cave and collect them in the container. The direction and amount of containers decide the direction and amount of stalactite products. Two controllers on the opposite side control the movement of two heating tools. The heating tool can heat the container to accelerate the stalactite growth and control the stalactite growth on the vertical level.


I used the working principle as vacuum to absorb the water, while the fan blade rotated; the air pressure in the container is belower than outside. So the waterdroplets can flow into the container from these pipes. The sensor can sense the water and stalactite, if the container is full, it will sent signals to controller. In the early days, the stalactite will growth on this fiber structure. The heating tool have a heater, and the control system 1 control the open and close of the heater's claw, the control system 2 control the movement of heater on the vertical level. The movements are all controlled by different gears rotated.


The absorb network

The controller

This picture mentioned the working process of this system. Once a container is full of water, it will send signals to controller and one heating tool will move to this container and heat it. While it is full of stalactite crystal, the heating tool will use the claw to pull it firmly downward and continue to form the stalactite.

This time-based image mentioned how the crystal growth. In the 5th year, the seed crystal growth on the fiber structure. In the 10th year, the stalactite will grow naturally on the area where the system cannot absorb water, and then connect with the stalactite growth on the fiber. And 15th year, 25th year or maybe more longer, the stalactite pillar will be formed.