Which ultrasonic sensor for your face?

[hxtasy]

Ok so say i have an application that measures how close your head is to something.


I'm currently looking at ultra sonic sensors, I'm not sure which type to get. I am mostly worried about how accurate they will be. Say I'm measuring your head right now how far away it is from your monitor, i need the signal to bounce off your head, not anything in the background, so I'm guessing it has to be a narrow beam width.

Also, what are typical outputs of these things? I know they operate at frequencies higher than 20KHz, but is there a way they can still give you a headache if one is near your ear for extended periods of time?


any input appreciated.

 

[hxtasy]

Ok so i found some on this site:
http://www.superdroidrobots.com/shop/search.asp

which are way to expensive for what i need. Then i found some on www.mouser.com[/URL]. but one of them is a transmitter/receiver, and in the data sheet it doesn't really say how to hook it up and it appears to only have two wires coming off of it, how could this work?

 

[oswaler]

I would recommend using a time-of-flight ultrasonic sensor for measuring the distance between your head and an object. These sensors use a narrow beam width and are very accurate in measuring distances. They also have a fast response time, making them suitable for real-time applications.

In terms of outputs, ultrasonic sensors typically provide a digital output in the form of a voltage or current signal. Some sensors may also have an analog output, giving a continuous reading of the distance.

As for your concern about potential headaches from extended exposure to ultrasonic waves, it is important to note that these sensors operate at a frequency higher than 20 KHz, which is above the range of human hearing. Therefore, they should not cause any discomfort or headaches. However, it is always recommended to follow safety guidelines and limit exposure to high-frequency waves.