[time-nuts] AN/URQ13 reference AT cut crystal?

[Bob kb8tq]

Hi

This is probably a better way to look at the various aspects of a quartz 
crystal:

http://www.mt-berlin.com/frames_ao/descriptions/sio2.htm <http://www.mt-berlin.com/frames_ao/descriptions/sio2.htm>

First thing to look at is the number of directions you get a different speed of
sound. Each of those forms an “axis” you might want to rotate around. 

Bob


> On Feb 17, 2021, at 6:31 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
> kb8tq at n1k.org said:
>> …… and there are whole families of crystal cuts that have been optimized for
>> use as thermometers. There is no need to compromise on something like an AT
>> or SC if you are after temperature. There are lots of different  cuts to pick
>> between.  
> 
> How many degrees of freedom are there if I want to make a crystal?  What 
> fraction of the space has been explored?
> 
> Rotation in 3D has 3 degrees of freedom, but we are making a plane so I think 
> we get one back.
> 
> How accurately does a the crystal have to be oriented?  If I'm doing a brute 
> force search, how close together would I have to make test samples in order to 
> not jump over something interesting?
> 
> 
> If I pick a type of cut, say AT, does the shape (round, rectangular) effect 
> the temperature profile?  If it's rectangular, that may add another degree of 
> freedom.
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.