new thermomechanical terahertz detector

[Phil Hobbs]

On 5/17/19 12:00 PM, Rick C wrote:

On Friday, May 17, 2019 at 4:34:24 AM UTC-4, Phil Hobbs wrote:
On 5/16/19 11:37 PM, nuny@bid.nes wrote:
On Thursday, May 16, 2019 at 1:25:48 PM UTC-7, John Larkin wrote:
On Thu, 16 May 2019 19:26:30 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

new thermomechanical terahertz detector:
https://www.sciencedaily.com/releases/2019/05/190516103718.htm

It will be interesting to make an imaging array of these things. Will
all the resonators talk to one another, like several pendulums on a
table?

How does one excite and read out, say, 100,000 micro-mechanical
oscillators?

What's the response time? If it's faster than the expected rate of change of temperature all over an image, just have one detector and scan an image over it.


Mark L. Fergerson


There's a huge SNR hit from doing that.

The eye is a very good filter. Besides, you only have to be "good enough". This is engineering after all. Either it meets the requirements or it doesn't.

Wow, that's profound.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

 

[Phil Hobbs]

On 5/16/19 4:51 PM, John Larkin wrote:

On Thu, 16 May 2019 16:33:24 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 5/16/19 4:25 PM, John Larkin wrote:
On Thu, 16 May 2019 19:26:30 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

new thermomechanical terahertz detector:
https://www.sciencedaily.com/releases/2019/05/190516103718.htm

It will be interesting to make an imaging array of these things. Will
all the resonators talk to one another, like several pendulums on a
table?

How does one excite and read out, say, 100,000 micro-mechanical
oscillators?



Perhaps you could make an array of N**2 oscillators of sufficiently
different frequency that they wouldn't lock together, and then tile the
arrays. That way you wouldn't get nearest-neighbour locking. It'll
obviously need a pixel-by-pixel calibration.

The existing FLIR type uncooled sensors need individual pixel cal.
Mine flips down a shutter about once a minute, for a few seconds, to
do that. They probably hide bad pixels too.


Alternatively they could drive all of them at one frequency and watch
the phase of the response of each pixel.

That's good. Blast them all together to get them going, then watch
them ring down. It will still be interesting to do that.

Simpler than that. Drive them all CW and look at the response phase by
using the multiplexer as a sample/hold phase detector.

> It would be great to have a cheap hi-res thermal imager.

Yup. Probably not going to be cheaper than a microbolometer though.

Cheers

Phil Hobbs


--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

 

[John Larkin]

On Fri, 17 May 2019 13:17:06 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 5/17/19 12:00 PM, Rick C wrote:
On Friday, May 17, 2019 at 4:34:24 AM UTC-4, Phil Hobbs wrote:
On 5/16/19 11:37 PM, nuny@bid.nes wrote:
On Thursday, May 16, 2019 at 1:25:48 PM UTC-7, John Larkin wrote:
On Thu, 16 May 2019 19:26:30 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

new thermomechanical terahertz detector:
https://www.sciencedaily.com/releases/2019/05/190516103718.htm

It will be interesting to make an imaging array of these things. Will
all the resonators talk to one another, like several pendulums on a
table?

How does one excite and read out, say, 100,000 micro-mechanical
oscillators?

What's the response time? If it's faster than the expected rate of change of temperature all over an image, just have one detector and scan an image over it.


Mark L. Fergerson


There's a huge SNR hit from doing that.

The eye is a very good filter. Besides, you only have to be "good enough". This is engineering after all. Either it meets the requirements or it doesn't.


Wow, that's profound.

Cheers

Phil Hobbs

Farnsworth's original camera tube was the Image Dissector, which
scanned the entire electron image across the aperature of a small
photomultiplier. So for N pixels, he wasted (N-1)/N of the available
photoelectrons. Actors don't enjoy performing under arc lights.

Same idea, scan and throw away most of the signal.

The MEMS resonators can, however, continue to accumulate phase error
whether you are looking at them or not. That's more like a vidicon,
where the pixels keep accumulating signal between readout hits.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[Rick C]

On Friday, May 17, 2019 at 1:17:15 PM UTC-4, Phil Hobbs wrote:

On 5/17/19 12:00 PM, Rick C wrote:
On Friday, May 17, 2019 at 4:34:24 AM UTC-4, Phil Hobbs wrote:
On 5/16/19 11:37 PM, nuny@bid.nes wrote:
On Thursday, May 16, 2019 at 1:25:48 PM UTC-7, John Larkin wrote:
On Thu, 16 May 2019 19:26:30 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

new thermomechanical terahertz detector:
https://www.sciencedaily.com/releases/2019/05/190516103718.htm

It will be interesting to make an imaging array of these things. Will
all the resonators talk to one another, like several pendulums on a
table?

How does one excite and read out, say, 100,000 micro-mechanical
oscillators?

What's the response time? If it's faster than the expected rate of change of temperature all over an image, just have one detector and scan an image over it.


Mark L. Fergerson


There's a huge SNR hit from doing that.

The eye is a very good filter. Besides, you only have to be "good enough". This is engineering after all. Either it meets the requirements or it doesn't.


Wow, that's profound.

Glad I could help with your education.

--

Rick C.

-- Get 5,000 miles of free Supercharging
-- Tesla referral code - https://ts.la/richard11209

 

[Phil Hobbs]

On 5/17/19 1:37 PM, John Larkin wrote:

On Fri, 17 May 2019 13:17:06 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 5/17/19 12:00 PM, Rick C wrote:
On Friday, May 17, 2019 at 4:34:24 AM UTC-4, Phil Hobbs wrote:
On 5/16/19 11:37 PM, nuny@bid.nes wrote:
On Thursday, May 16, 2019 at 1:25:48 PM UTC-7, John Larkin wrote:
On Thu, 16 May 2019 19:26:30 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

new thermomechanical terahertz detector:
https://www.sciencedaily.com/releases/2019/05/190516103718.htm

It will be interesting to make an imaging array of these things. Will
all the resonators talk to one another, like several pendulums on a
table?

How does one excite and read out, say, 100,000 micro-mechanical
oscillators?

What's the response time? If it's faster than the expected rate of change of temperature all over an image, just have one detector and scan an image over it.


Mark L. Fergerson


There's a huge SNR hit from doing that.

The eye is a very good filter. Besides, you only have to be "good enough". This is engineering after all. Either it meets the requirements or it doesn't.


Wow, that's profound.

Cheers

Phil Hobbs

Farnsworth's original camera tube was the Image Dissector, which
scanned the entire electron image across the aperature of a small
photomultiplier. So for N pixels, he wasted (N-1)/N of the available
photoelectrons. Actors don't enjoy performing under arc lights.

Same idea, scan and throw away most of the signal.

The MEMS resonators can, however, continue to accumulate phase error
whether you are looking at them or not. That's more like a vidicon,
where the pixels keep accumulating signal between readout hits.


Yes, as long as you sample them faster than f0/Q.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com