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Topics - Physikfan
Pages: [1]
1
« on: January 24, 2019, 07:09:46 PM »
Using a condenser microphone and the FFT HP3561A analyzer, a 200 Hz square wave signal was fed into an ESL (Martin Logan Sequel II electrostatic loudspeaker): This is the electrostatic speaker: FT signal of the 200 Hz square wave of the function generator: FT signal of the condenser measuring microphone:
2
« on: January 08, 2019, 08:44:16 PM »
The acoustic spectra of sung vowels of several persons were recorded with a condenser microphone and the FFT-Analyzer HP3561A: In the first row the spectra for A, E, I, O, U are shown, person 1. In the second row the spectra for A, E, I, O, U are shown, person 2. In the third row the spectra for A, E, I, O, U are shown, person 3. Although the fundamental frequencies of the vowels of the first person (in the first row) are much smaller than those of the two children (in the second and third rows), the spectral patterns for the individual vowels are reasonably similar. This is due to the resonance characteristics of the vocal tract, where each vowel can be identified in specific frequency bands (the formants) due to its spectral distribution.
3
« on: December 15, 2018, 02:24:20 PM »
Hello Tesla friends I have two questions: 1. Has anyone done an electromagnetic spectral analysis of Tesla coils in operation? 2. Has anyone determined the self-resonances of Tesla coils in the off state, perhaps with shorted spark gaps? Just before Christmas, two atmospheric Tesla discharges:
4
« on: July 10, 2018, 12:50:46 PM »
5
« on: June 27, 2018, 06:34:22 AM »
The magnetic flux density was measured at the surface of permanent disc magnets by a Hall probe: Disc magnet 30mm diameter, height 15 mm, NdFeB: Results: Disc center 0.44 T 1 cm distance 0.2 T 2 cm distance 0.06 T Edge up to 0.5 T Side part of the disc (curved) 0.06 T Disc magnet 45 mm diameter, height 30 mm, NdFeB: Results: Disc center 0.52 T 1 cm distance 0.28 T 2 cm distance 0.14 T edge up to 0.6 T side part of the disc (curved) 0.06 T
6
« on: June 05, 2018, 10:27:37 AM »
The relatively old current probe Tektronix P6042. This current probe allows currents from 1 mA/div to 1 A/div (DC to 50 MHz) to be measured without disconnecting the circuit: The Tektronix current probe P6303, up to a maximum of 100 A. The maximum frequency, depending on current level, is 15 MHz: with the control module AM503B: The Tektronix current clamp CT5 for even higher currents up to 1000 A, but only AC, maximum frequency, depending on current level, is 20 MHz: Picture follows.
7
« on: March 17, 2018, 09:02:27 PM »
The picture shows an electrostatic voltmeter with light mark pointer for a maximum of 30 kV. In contrast to the other 10 kV electrometer, this instrument has two additional measuring ranges 7.5 kV and 15 kV:
8
« on: March 14, 2018, 09:21:43 PM »
The picture shows an electrostatic voltmeter with light pointer for a maximum of 10 kV. My questions to all: Please, who else has an electrostatic voltmeter in his instrument collection? Do you have some experience in dealing with voltage measurement by electrometers? Have you perhaps measured the self-capacitance and the internal resistance of your device?
9
« on: March 05, 2018, 12:16:56 PM »
Under Windows 10, the HP Scanjet 6300c worked without problems. After an automatic update to a new version of Windows 10, the scanner stopped working. Despite much work, I could not use the scanner anymore. Please, does anyone have any advice?
regards
Physikfan
10
« on: February 24, 2018, 05:59:29 PM »
The spectra are Hg spectra, photographed from a Canon 10D, light source is a Hg high pressure lamp, the entrance slit is imaged with a quartz lens via a reflection grating on different screens: There are the spectra of the screens, in order from left to right As you can see, these cheap cardboards with fluorescent paint are well suited and only cost a few dollars for half a square meter.
11
« on: February 23, 2018, 09:24:30 AM »
The UV sensitivity of a Nikon D70 was measured by using a Hg spectrum. The camera was used without a camera lens in an open spectrometer configuration, consisting of a quartz lens, a reflection grating and a Hg high pressure lamp as a light source: In addition to the 436 nm and 404 nm lines of the Hg spectrum, the 365 nm line of the Hg spectrum in red is clearly visible.
12
« on: February 06, 2018, 10:14:19 PM »
I measured the UV absorptance of sun glasses to demonstrate the practical value of a simple spectroscopic apparatus in the UV. Here are the glasses: The spectra are photos of Hg spectra, light source is a Hg high-pressure lamp, the entrance slit is imaged with a quartz lens via a reflection grating on a screen, to detect the UV lines, the left part of the screen is coated with an ultraviolet luminous color. Here are the results: Reference spectrum: The camera is a Canon 10D, exposure time = 1/10 second, f/13, f = 105 mm, ISO 3200. Hg spectrum with sunglass absorptance: The camera is a Canon 10D, exposure time = 1 second, f/13, f = 105 mm, ISO 3200.
13
« on: February 03, 2018, 09:10:44 AM »
The spectra are photos of Hg spectra with constant exposure time, light source is a Hg high-pressure lamp, the entrance slit is imaged with a quartz lens via a reflection grating on a screen, to detect the UV lines, the left part of the screen is coated with an ultraviolet luminous color. The first picture is the Hg reference spectrum, the lines go deep into the UV. The second picture shows the Hg spectrum, filtered by cheap sunglasses. The color of the blue line in the spectrum of the sunglasses also corresponds to the color of the visual impression with unarmed eye. The color of the violet line in the Hg reflectance spectrum does NOT match the color of the visual impression with unarmed eye, and is an artifact, probably due to overexposure at this point. To my surprise, the quality of the sunglasses is excellent in terms of UV protection, I will now use these glasses as goggles for my further UV experiments. UV experiments with normal glasses are in preparation.
14
« on: January 28, 2018, 01:25:14 AM »
The spectra are photos of Hg spectra with increasing exposure time from top to bottom, light source is a Hg high-pressure lamp, the entrance slit is imaged with a quartz lens via a reflection grating on a screen, to detect the UV lines, the right part of an ultraviolet screen: Only in the first two spectra do the colors correspond to the visual impression with unarmed eyes. The blue line on the far left in the last spectrum is a ghost. Further experiments with quartz glass prism and zinc sulphide screen are in preparation.
15
« on: December 25, 2017, 11:58:15 AM »
To all friends of antique Geissler tubes The picture shows a complex shaped Geissler tube. Unfortunately, the corresponding metal cap with eyelet is missing during a contact. Please, does anyone know how to fix this problem? Best regards Physikfan
16
« on: November 19, 2017, 01:30:41 PM »
Two rechargeable batteries, one NiCd battery D and one NiMH battery C can not be recharged after 2 years of very moderate use: Both batteries were used in two different groups of each four identical batteries of the same type. The three others of each group still work perfectly. Now my question: Please who knows successful refreshment procedures of such batteries from personal experience?
17
« on: November 18, 2017, 12:47:35 PM »
Hello to all IT insiders
My question:
I currently have access to Internet boxes different providers at the same location. How can I reasonably objectively check the Mbit rates of different providers?
Please the answers in understandable language for non-professionals in digital electronics!!!
Best regards
Physikfan
18
« on: November 12, 2017, 01:59:28 PM »
Here are pictures of a commercial antique Tesla coil with tubes, probably built around the year 1950. Please, who might have a schematic for such or a similar device?
19
« on: November 06, 2017, 08:52:00 PM »
The two pictures show a beetle in a Geißler tube: (DC source, 9 kV, cathode top, anode bottom) Exposure normal, with room lighting, fluorescence on the glass wall Exposure 2 f-stops underexposed, room dark, fluorescence on the glass wall Exposure 2 f-stops underexposed, room dark
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