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1-10 of 10 Search Results for
photophone
Book Chapter
Series: AIPP Books, Archive
Published: January 1994
10.1063/9780735421059_004
EISBN: 978-0-7354-2105-9
ISBN-10: 0-917853-63-6
ISBN: 978-0-917853-63-0
...The following demonstrations are included in Section 3. Reflecting Photophone Motor-Generator (Speaker - Microphone) A Modern reflecting Photophone A System of Yes’s and No’s (Digital Sound) Light in a Rod Laser Light Bouncing Inside Plastic Block Laser Light Going Through...
Book Chapter
Series: AIPP Books, Archive
Published: January 1994
10.1063/9780735421059_002
EISBN: 978-0-7354-2105-9
ISBN-10: 0-917853-63-6
ISBN: 978-0-917853-63-0
... the fundamentals of a reflection “photophone.” Construct and explain a circuit that can transmit a sound signal over a light beam produced by an LED. Define “attenuation” in a sentence. Use a mathematical example to show a calculation of attenuation. Define “bandwidth” and “carrier wave.” Apply...
Book Chapter
Series: AIPP Books, Archive
Published: January 1994
10.1063/9780735421059_010
EISBN: 978-0-7354-2105-9
ISBN-10: 0-917853-63-6
ISBN: 978-0-917853-63-0
...! The importance of the photophone invention was that a. it explained the telephone b. it proved that light could carry information c. it helped improve the telegraph The type of signal carried by the photophone is a. analog b. digital The carrier wave for the reflection photophone...
Book Chapter
Series: AIPP Books, Archive
Published: January 1994
10.1063/9780735421059_001
EISBN: 978-0-7354-2105-9
ISBN-10: 0-917853-63-6
ISBN: 978-0-917853-63-0
.... The BIG DAY — 20. Arrive one hour early to meet with your host, put out the coffee and donuts, etc. — 21. Locate the nearest restrooms and have the custodian unlock them. — 22. Put out a few of already completed reflection photophones and bias circuits as models for the participants. — 23...
Book Chapter
Series: AIPP Books, Archive
Published: January 1994
10.1063/9780735421059_005
EISBN: 978-0-7354-2105-9
ISBN-10: 0-917853-63-6
ISBN: 978-0-917853-63-0
... that explains why the sunlight is so quiet whereas the room lights are so noisy. ____________ Try Demonstration B. Why must you turn off the room lights? ____________ Describe how increasing the distance from the reflecting photophone to the solar cell changes the sound. ____________ Can you use...
Book
Series: AIPP Books, Archive
Published: January 1994
10.1063/9780735421059
EISBN: 978-0-7354-2105-9
ISBN-10: 0-917853-63-6
ISBN: 978-0-917853-63-0
Book Chapter
Series: AIPP Books, Archive
Published: January 1994
10.1063/9780735421059_003
EISBN: 978-0-7354-2105-9
ISBN-10: 0-917853-63-6
ISBN: 978-0-917853-63-0
... the information-carrying light can best be transmitted and received. We will continue to focus on methods of light modulation in the demonstrations of this section, though the sources of light and information may differ from one to the next. The Photophone We can more carefully examine how light can be used...
Book Chapter
Series: AIPP Books, Archive
Published: January 1994
EISBN: 978-0-7354-2105-9
ISBN-10: 0-917853-63-6
ISBN: 978-0-917853-63-0
... Procedure for Demonstration A: Making a reflecting photophone Use a pair of scissors to cut the top half (rounded end) off a large balloon. Throw away the neck half. Stretch the rounded end of the balloon over a length of 3” diameter PVC pipe. Use tape to hold the balloon in place...
Book Chapter
Series: AIPP Books, Archive
Published: January 1987
10.1063/9780735420397_006
EISBN: 978-0-7354-2039-7
ISBN-10: 0-917853-27-X
ISBN: 978-0-917853-27-2
... with communication by sound, the string telephone, the transmissions of sound through tubes as is found in airplane sound systems to conventional toy telephones. Unfortunately, a reproduction of Bell’s “Photophone,” the “Astrophone” where light is modulated by a vibrating mirror and reflected onto a photocell...
Book
Series: AIPP Books, Archive
Published: January 1987
10.1063/9780735420397
EISBN: 978-0-7354-2039-7
ISBN-10: 0-917853-27-X
ISBN: 978-0-917853-27-2