On 8/12/2022 3:42 PM, Ed Lake wrote:
> On Friday, August 12, 2022 at 12:37:52 PM UTC-5, Volney wrote:
>> On 8/12/2022 11:59 AM, Ed Lake wrote:
>>> On Friday, August 12, 2022 at 9:48:11 AM UTC-5, Mikko wrote:
>>>> On 2022-08-11 17:03:13 +0000, Ed Lake said:
>>>>
>>>>> On Thursday, August 11, 2022 at 10:26:15 AM UTC-5, Mikko wrote:
>>>>>> On 2022-08-11 13:55:56 +0000, Ed Lake said:
>>>>>>
>>>>>>> LIDAR guns use two pulses. Radar guns use ONE pulse, which could
>>>>>>> theoretically consist of ONE PHOTON.
>>> {snip)
>>>
>>>> A typical police radar gun does not measure the frequency of its emission.
>>>
>>> WRONG. A radar gun captures a photon while it is transmitting and
>>> compares that photon to what it gets back.
>> THAT is wrong. Radar guns don't measure individual photons. They can't,
>> that falls far below the noise level.
>
> In theory a radar gun can measure the speed of a target using just one photon.
> NASA has a web page about that. It's here:
https://www.grc.nasa.gov/WWW/k-12/Numbers/Math/Mathematical_Thinking/how_do_police_radars.htm
There's that infamous NASA public relations page again, the one where
you claim the author is some sort of rocket surgeon or something.
> In practice, however, it's a bunch of photons. There is no "noise level" involved,
> since radar guns use a oscillation frequency range that isn't used by anything else.
Sheesh! Your knowledge of electronics is ZERO if you claim that! There
is internally generated thermal noise in the electronics, shot noise,
perhaps part of the CMBR! (guess how that was discovered!) There is NO
WAY a single 30 GHz photon could be picked out of the noise crowd.
(remember, microwave is toward the low end of the electromagnetic energy
spectrum. Microwaves make up for it in the sheer number of photons
involved, which makes them more wavelike than visible light or X rays.
>
>>
>> What happens is the electromagnetic effects of the received signal on
>> the antenna convert it to an Electrical AC signal in a wire/circuit
>> board trace/electronic component. At this point there are NO LONGER any
>> photons (or waves) involved, it is an AC electronic signal corresponding
>> to what was received. Bandpass filters and the overall horn design
>> eliminate all but "close" frequencies. These are routed to a detector
>> circuit where they are combined with another AC signal, the transmitted
>> AC frequency. (note that it is also NOT photons or waves, it hasn't had
>> a chance to become either yet). The detector calculates the difference
>> frequency, and this frequency has a direct relationship to the relative
>> speed difference. This conversion is done and displayed as a speed.
>
> I think you are talking about how RADIOS work, not radar guns.
Radar guns ARE radios, both transmitters and receivers!
I'm VERY surprised you never noticed that, or mentioned silliness like
how radio transmitters send streams of photons everywhere and a receiver
detects radio photons or bla bla bla.
A radar gun transmits on one frequency an unmodulated radio signal in
the microwave range, that is just a pure carrier wave. It is tuned to
receive in a narrow band at the same frequency. It is not tunable to
different "stations", but the detector detects the difference
frequencies. It is VERY MUCH like an AM (better yet SSB or DSB)
receiver, or the IF stage of nearly all radios. Very old police radars
even had an audio jack where you could listen to the difference
frequency (in the audio range, higher the frequency the faster the
speeder). I bet if someone was insane enough to try, they could create a
metal-lined speaker cone, point such a radar at it and listen to the
music played on the speaker on such a radar gun! *such foolishness
needs more thought*
(this is GUARANTEED to get some sort of "Ridiculous!!!" response from
Ed, but it's because he won't/can't think this through)
>
>>> It is very unlikely that any two radar guns emit photons at exactly the
>>> same frequency. A typical radar gun may emit photons that THEORETICALLY
>>> oscillate 35 BILLION times per second,
>> No science theory theorizes photons oscillate, they don't. The
>> frequency is a mass effect of zillions of photons.
>
> Nonsense. You are DEFINITELY talking about RADIOS, not radar guns.
Of course I am talking about radios because radar guns ARE a form of
radio! A transmitter and (specialized) receiver in one package.
> And you are mistaking "modulation" for frequency. Radio transmitters emit
> zillions of photons in a continuous stream, but they modify the stream
> so that the photons are sent in bunches of different sizes. AM radio is
> Amplitude Modulation radio, which means they vary the number of photons
> in the bunches. FM radio is Frequency Modulation radio, which means they
> modify the oscillation frequencies of the photons they transmit to cause
> different sounds and signals. The rule is that you cannot vary the oscillation
> frequency of individual photons by more than 75 kHz away from the
> "station frequency."
The microwave radio transmitter transmits an unmodulated signal. The
receiver operates more like an SSB (single sideband) reeiver, not AM or
FM. I bet you have absolutely ZERO knowledge what the fuck that is, you
probably never even HEARD of that. (I was a ham radio operator for a
while). Anyway a SSB receiver creates the difference frequency between a
local oscillator and the received radio signal, this is in the audio
range and you can listen to the speaker's voice. Very touchy tuning, if
not nearly exact the voice sounds like it was fed through one of those
electronic voice changing gadgets, more than a teeny bit off the voice
isn't intelligible at all. If you tune to an unmodulated carrier, you'll
hear a constant tone at the difference frequency between the transmitted
and local oscillator frequenceies.
>
>>> but in reality the photons are
>>> unlikely to oscillate at that EXACT frequency.
>> Because they don't oscillate at all.
>>
>> Ed, you need to stop presenting your BELIEF that photons oscillate as if
>> it was scientific theory. NO theory has oscillating photons in it.
>>> If the gun emits photons
>>> that oscillate 35,000,000,012 times per second,
>> Photons don't oscillate. You need to point out that your BELIEFS are
>> just that, your BELIEFS, and not science theory.
>
> I wasn't presenting any "theory."
So you admit "oscillating photons" are just your BELIEF and not part of
any scientific theory? Good, but why do you present your BELIEF as if it
was already considered factual? Why do you stick to it despite being
corrected by many people, including physicists?
> I was just trying to make sense out of
> all the bad information that's out there.
Well you failed at making sense of the information. BTW what information
do you consider "bad", and why do you believe it's "bad"?
> When I did, I thought I'd share
> my findings with anyone who might be interested.
Sharing your bad findings as if factual/correct is a rather bad thing to do.