Noise and Vibration Product News

NoiseCompass, Noise monitoring with direction

Noise and Vibration Product News

NoiseCompass, Noise monitoring with direction

Noise monitoring with direction

One of the greatest challenges with unattended noise monitoring is to ensure that the monitored site really is the source being measured.

What is making the noise?

Is it the construction site, a nearby railway or an aircraft?

Read more about Noise Compass.

Asia Noise News Building Accoustics Noise and Vibration Product News

The Nano-guitar String that Plays Itself

Scientists at Lancaster University and the University of Oxford have created a nano-electronic circuit which vibrates without any external force.

Using a tiny suspended wire, resembling a vibrating guitar string, their experiment shows how a simple nano-device can generate motion directly from an electrical current.

To create the device, the researchers took a carbon nanotube, which is wire with a diameter of about 3 nanometers, roughly 100,000 times thinner than a guitar string. They mounted it on metal supports at each end, and then cooled it to a temperature of 0.02 degrees above absolute zero. The central part of the wire was free to vibrate, which the researchers could detect by passing a current through it and measuring a change in electrical resistance.

Just as a guitar string vibrates when it is plucked, the wire vibrates when it is forced into motion by an oscillating voltage. This was exactly as the researchers expected.

The surprise came when they repeated the experiment without the forcing voltage. Under the right conditions, the wire oscillated of its own accord.

The nano-guitar string was playing itself.

Lead researcher Dr Edward Laird of Lancaster University said: “It took us a while to work out what was causing the vibrations, but we eventually understood. In such a tiny device, it is important that an electrical current consists of individual electrons. The electrons hop one by one onto the wire, each giving it a small push. Usually these pushes are random, but we realized that when you control the parameters just right, they will synchronize and generate an oscillation.”

So what note does the nano-guitar play?

“The nanotube is far thinner than a guitar string, so it oscillates at much higher frequency — well into the ultrasound range so no human would be able to hear it.

“However, we can still assign it a note. Its frequency is 231 million hertz, which means it’s an A string, pitched 21 octaves above standard tuning.”

The nano-oscillator could be used to amplify tiny forces, such as in novel microscopes, or to measure the viscosity of exotic quantum fluids. These experiments will be pursued in a new laboratory that Dr Laird is setting up in the Physics Department at Lancaster, supported by a €2.7M grant from the European Union.


Written by: Phawin Phanudom

Noise and Vibration Product News

PLACID new range of integrating sound level meters with calibrator (type 2)

PLACID developed a new range of integrating sound level meters with a calibrator. The integrating sound level meter and calibrator are robust yet light and very easy to use.

Ideal for safety officers in factories, for sound enforcement in entertainment venues, to measure noise nuisance, road traffic, airport noise etc. etc.

Read more about PLACID instruments.

PLACID CA-02 Calibrator for sound level meter

Noise and Vibration Product News

SPEKTRA improved True Free Field Calibration system, CS18FF

SPEKTRA improved True Free Field Calibration system, CS18FF

SPEKTRA improved True Free Field Calibration system, CS18FF

  • CS18 FF: The Free Field Calibration System contains a newly improved anechoic chamber.
  • The new developed chamber is very easy to disassemble and assemble, practical for shipping , moving.
  • It has excellent free field properties in the full range of frequencies from 125 Hz to 20 kHz
  • A LED lightning system has been added to the chamber
  • To position the DUT precisely and read out the sound level meter display clearly we 2 camera’s are installed in the anechoic chamber.
  • The modular structure of the chamber allows an easy modification of the anechoic chamber for other frequency ranges or test purposes
  • The anechoic chamber is equipped with 4 wheels for easy handling / moving

SPEKTRA CS18FF datasheet