1
$\begingroup$

I'm a neuroscientist interested in building a device to replicate the following study.

https://www.nature.com/articles/s41598-018-24924-9

Essentially, they sent air through a nose catheter to stimulate mechanically sensitive cells of the nose. They had 8 seconds of continuous air, followed by 12 seconds off (0.05 Hz). This was to mimic the breathing associated with deep meditation, and they report it induced alterations to consciousness.

I'm interested in building a device that can replicate their paradigm, as well as send air bursts at an arbitrary frequency of my choosing. Ideally the range should be between very slow (~0.05 Hz) and higher frequencies (~100 Hz).

I understand pulsing most standard pumps won't work for those higher frequencies. My mechE friend proposed some two way valve that would be able to pulse between two directions, the nose catheter, or just out to the air. I could then just use a standard continuous pump or fan.

I'm unfamiliar with the terminology and haven't been able to find such an electrical valve. Does anyone know of any such valves, or perhaps has a better design in mind?

Thanks everyone!

$\endgroup$
1
$\begingroup$

The RDWorks forum has a discussion which covers adding an air diverter valve that can be operated by the Ruida class of laser cutter controllers. It is a simple matter of directing a relay to the line that trips the solenoid of this valve.

Priced at US$22.49 currently, it won't break the bank. Combined with an arduino and a MOSFET to handle the 24v load current of the coil, you should be able to regulate the airflow in the manner you describe.

air valve

$\endgroup$
  • $\begingroup$ airskys.com/4v230c-08-solenoid-valve Here they state the maximum action frequency as 5 cycles/second. Does this mean the maximum pulse rate of air is 5 Hz? $\endgroup$ – asheff794 Feb 5 '19 at 0:48
  • $\begingroup$ I suspect the limitations are related to the mechanical components of the air valve. I found another product with a 0.45 ms cycle, equivalent to 2222 Hz! smcusa.com/products/sx10-2-port-high-speed-valve~126506 The pick list for product selection lists the highest capacity at 1200 Hz, within your requirements. All of them fall within your requirements, and offer varying flow rate capacities as well. $\endgroup$ – fred_dot_u Feb 5 '19 at 23:09

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.