Anechoic Chambers
Published on Nov 27, 2015
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PRESENTATION OUTLINE
Sound Around Us
- 0dB: Threshold of hearing
- 120dB: Threshold of pain
- 30dB: Leaves rustling, 55 dB: Conversation, 80dB: Elmwood
- Humans consistently experience 30-80dB
- Problem with acoustic engineering?
What is an anechoic chamber?
- An-echoic: non-echoing
- Isolated room with pyramidal or wedge foam paneling design
- Acoustic anechoic chamber: Greatly lessens the sound waves that travel back to a subject
- Gets rid of all ambient noise from outside
- On average, 10-20dB
wedge pattern
What are the uses ?
- Testing the quietness of appliances
- Audio recording without reverb
- New Technologies:
- Audio sensors
Semi-anechoic chamber
- Variation of acoustic anechoic chamber
- Raised solid floor instead of mesh floor with foam wedges underneath
- Used to accommodate heavy machinery
- Recording studios
Fully acoustic anechoic chamber
Semi anechoic chamber
Orfield Laboratories Anechoic Chamber
- Minneapolis, Minnesota
- "The quietest room in the world"
- Measured at -9.4dB
- Unique effects on people
- NASA research
Untitled Slide
Radio Frequency Anechoic Chambers
- Most popular version looks similar to acoustic anechoic chambers
- Radioactive absorbent material (Iron and carbon)
- Installed in a Screened room
- Similar function, only with radio waves
- Another version made of flat ferrite (pure iron) panels
Uses of RF anechoic chamber
- Antenna radiation patterns
- Increased functions in antennas (wifi, bluetooth, LTE)
- Radar cross sections
- EMI
