Monitors for the sound of breaking glass. The Glass Break Detector is a fully-supervised, tamper-protected, ceiling- or wall-mounted unit. It communicates with the 2GIG Control Panel using the 345 MHz frequency.
For glass to shatter, the sound must match the glass's natural resonant frequency (around 556 hertz) and be sufficiently loud (around 105 decibels). An empty wine glass, especially a thin one, is ideal for this experiment, due to its ability to amplify stress per particle.
Shock sensors respond to the shaking of breaking glass but can also be triggered by other vibrations, including thunderstorms, sonic booms or fireworks. An acoustic audio switch sensor detects the sound of breaking glass.
At frequency mode 4 (500Hz) exciting things started to happen. When animating the vibration here, we saw that this coincides with the video shown before. In other words, if we create a sound frequency of 500Hz together with a sound level of over 100dB, then this glass will in theory break and the myth thus confirmed.
Mounts on any wall, in the window frame, or on the ceiling with no minimum range and a maximum range of 25 ft (7.6 m) to the glass.
Glass break detectors often require: Amplification and filtering of both low-frequency (< 300 Hz) and subsequent high-frequency (> 9kHz) glass break sounds. Reduced maintenance through battery-powered designs with long battery life. Ultra-low-power wireless communication with 2.4-GHz and Sub-1-GHz networks.
Because glass break sensors work by analyzing sound frequency, it is possible that certain sensors will be set off by a loud dog bark or even a powerful gust of wind.
It is found that the vibrations of the glass are low at frequencies from 20-200 Hz and much of the sound energy falls within the frequency range 200 -500 Hz where the resonance frequency is detected at 400Hz.
By testing the response of the human body on a vibrating platform, many researchers found the human whole-body fundamental resonant frequency to be around 5 Hz.
The resonance created by exposing the beaker to the sound wave forces the glass to vibrate and distorts the shape of the beaker. The amplitude of the sound wave from the speaker is increased until the oscillation of the beaker exceeds the elastic limit of the glass and the beaker breaks.
Glass-break detectors are effective tools for protecting your home. Both shock and acoustic detectors alert you if a burglar tries to break the glass in your doors or windows. While window contact sensors can tell you if a burglar tries to raise a window, they don't work if the thief instead breaks the window's glass.
Additionally, taking the batteries out and putting them back in again can work. For some sensors, it's necessary to press the button on the glass break sensor a set number of times, pause, then press it again. That resets the sensor and allows it to continue working normally.
Glass is often the most permeable materials for RF radiation to enter a home or bedroom, but there are types of glass that have a higher metal content.
There are several ways to do this. One way of making this measurement is to use a microphone/preamp/frequency counter, 3 strike the glass gently with a rubber bung, and record the average value of several measurements. To identify the higher frequency mode of vibration you will have to use an audio spectrum analyzer.
Specifically, for a sound to break glass it needs to have a high intensity. Experiments of how sound breaks glass have shown that a minimum intensity of 105 dB is required. Considering that normal speech is at about 60 dB and a lawnmower is at 90 dB, it's difficult to achieve the required intensity with a human voice.
The overall range of resonant frequencies was found to be from 9 to 16 Hz and independent of mass, height and mass to height ratio. The mean values (+/-1 s.e.) were 12.2 +/- 0.1 Hz for males and 12.8 +/- 0.2 Hz for females with an overall mean population value of 12.3 +/- 0.1 Hz.
Especially dangerous is infrasound at the frequency of 7 Hz, since this sound, generating frequencies, close to characteristic frequencies of the organs of our body, may disturb the heart or brain activity. Machines, natural sources storms, earthquakes, hurricanes, etc. generate infrasound.
The basic idea behind finding your resonance frequency is that you breathe at various different frequencies for a certain amount of time and then identify which frequency led to the strongest response, i.e. the highest HRV.
The note that a wine glass makes when you hit it is its resonant frequency - the frequency at which the glass vibrates most efficiently. If you can match this tone you can smash the glass. The note will be around one octave above middle C, depending on the size of the glass. The real trick is singing loudly enough.
The vibrations created by your fingers moving over the rim of the glass, causing the glass to resonate. This means that you are causing the crystals in the glass to vibrate together at a similar frequency to create one clear tone. You can change the pitch by adding or subtracting water to the glass.
Using both glass break sensors and motion sensors enhance a security system's capabilities. However, for budget conscious consumers, we usually suggest using motion sensors before glass break sensors. Reliable security is achievable using door sensors and window sensors and well placed motions.
The light patterns on your Glass Break Sensor will help you identify if it's working well or not. When you press the setup button on the front of the device, you may see: Three green flashes, a pause, followed by three green flashes. That means it is ready to connect to your Base Station.
Most security experts agree that in order to provide the most protection, both glass break sensors and window sensors are recommended. Here are a few reasons why having both types of sensors in your home can provide safety and peace of mind: Protection against both forms of entry.