Vibroscope - Vibration Measurement and Analysis Tools
"Vibroscope" is a vibration measurement and analysis tools by using the iPhone's acceleration sensor in real-time. It allows you to monitor by visualizing the low-frequency vibration, such as inaudible by ear.
This app can be intuitively detected an acceleration amount, that displays the two-axial coordinates in the horizontal direction and the time-axis waveform in the vertical direction. It can measure by determining the horizontal or vertical direction to suit the attitude of the iPhone automatically, so as to be available on the floor and desk or handheld.
In addition, "Vibroscope" is also equipped with the ability to analyze the frequency components of the low-frequency vibration by the FFT analyzer.
Also, the "GAL" unit of earthquake acceleration can be converted by multiplying the 100 in this app's measurement display value.
If a detailed sound level analysis is required, it is recommended that you use our iPhone sound level measuring and analysis app "Sound Level Analyzer".
Please to click the link below to visit the product page on AppStoreTM.
"Vibroscope" can be used in applications such as the following utilization examples:
"Vibroscope" has two operational modes, MAIN and FFT. By tapping each button, its operation mode is selected and executed.
This mode makes the vibration measurement in general.
By tapping Start button to start the vibration level measurement, and it then stop by tapping Stop button.
The display speed will be changed in the display speed button (FAST, SLOW). Measurement display will be able to shift the display range by up-down button ( [+] or [-] ).
Vibration level measurement displays the effective acceleration value and its maximum value (Peak value).
It can be intuitively detected an acceleration amount, that displays the two-axial coordinates in the horizontal direction and the time-axis waveform in the vertical direction. By tapping "peak" button, you can control whether to display numerical value.
It can be measured by determining the horizontal or vertical direction to suit the attitude of the iPhone. In the two-axis graph display, either the x-y-axis or x-z-axis or y-z-axis by the attitude of the terminal will be displayed. (For this automatic screen display, you need to unlock "Portrait orientation lock" in the iPhone device settings.)
During measurement operation, tap the "Axis" button to change the axis direction in the graph display. Each time you tap the "Axis" button, the axis direction will be switched sequentially, so please match the axis direction you want to display. In this case, the "Axis" button will be displayed as "XYZ", "XZY", "ZYX", etc., according to the axis direction selection. Note that the "Axis" button is not displayed in logarithmic scale view.
The ability to display average acceleration per second has been added in the latest version. You can toggle between displaying instantaneous acceleration and average acceleration. The default is instantaneous acceleration.
* Method of finding the average acceleration
The instantaneous acceleration is integrated and the velocity is calculated. The average acceleration is obtained by dividing the difference in velocity between two points by the time interval as shown in the figure below. The time interval in this app is set to 1 second.
You can change to logarithmic scale view by tapping "Log" button. To return to the linear scale graph display, tap "Linear" button.
This is a display mode to detect minute vibration.
In normal use, the graph does not become stable because the vibration does not converge. Graphing extremely small numbers can be affected by errors due to noise and temperature in the operating environment or time variations in sensor calibration.
In addition, if you move the terminal in the middle of measurement, the sensor correction may be wrong, and the acceleration value may converge to a fixed amount, so it is recommended to stop the measurement and re-measure.
The following functions are applied in common regardless of the selected operation mode.
The 3-axis composite acceleration is drawn as an orange line. In "Vibroscope Lite", it is displayed by tapping "Compo" button.
By tapping "slow" or "fast" button, the sampling period of the acceleration sensor is specified. Please set it in accordance with the occurrence tendency and type of the measurement source. It is not possible to switch the sampling period during the measurement. In addition, the sampling period may be influenced by the hardware environment and the operating environment of the iOS system.
- [FAST] : 100Hz (default)
- [SLOW] : 40Hz
By tapping "+" or "-" button, you can specify the display range of the vibration level measurement. Please be set according to the magnitude of the acceleration of the measurement source. p>
- [+]: increase the display range.
- [-]: decrease the display range.
FFT mode displays the frequency analysis results of the Fast Fourier Transform (FFT). FFT analyzer performs frequency spectrum analysis using the 3-axis acceleration (X, Y, Z) and 3-axis composite acceleration (COMPO) as input signals, and is displayed them in real time.
By tapping START button to start the FFT Analysis, and it then stop by tapping STOP button. Measurement parameter settings in MAIN mode will be reflected directly.
During the measurement operation, the FFT graph can be selected from three types of display format (Axes, Axis-1, Axis-2)." By tapping the "Axis" button, the display axis can be selected, and the "Axis" button will display "XYZ", "XZY", "ZYX", etc. according to the axis direction selection.
In MAIN mode, tapping the "Peak" button turns the peak measurement value on and off. The peak level hold value during the current measurement is displayed. The 3-axis composite acceleration is displayed as "C".
By tapping "Setting" button, it displays this common settings for each operational mode.
This is a timer setting for vibration level measurement. Measurement time can be set from 1 second up to 1 hour.
- Measurement time : 1 second, 5 seconds, 10 seconds, 15 seconds, 30 seconds, 1 minute, 5 minutes, 10 minutes, 15 minutes, 20 minutes, 30 minutes, 45 minutes, 60 minutes
It can specify the delay time from when you tap the start button to the actual measurement start. Time setting is up to 20 seconds. You can avoid the influence of tap vibration of start button.
- Start delay time : 0 - 20 seconds
It can select the reference level [0 dB] of vibration acceleration from the following reference value in FFT mode.
- Reference Level[1] : 1e-6 [m/s2]
- Reference Level[2] : 1e-5 [m/s2]
By tapping "Snap" button, you can capture the measured screen image to Camera roll. It will be saved in PNG format.
In addition, the saved the image will be inserted time stamp (date and measured time data).
At the first time, the confirmation of access to the camera roll is required once from iOS system when you press "Snap" button.
Measurement data and time information will be saved as a LOG file. LOG file can be external output using the iPhone file sharing function, so it allows you to data analysis offline. If the location information display is permitted, the location information at the start of measurement will be stored in the logging data.
The LOG file is output in text format with the following data strings:
Log data can be transferred from an iOS device to a Mac or PC using the iTunes File Sharing feature. macOS Catalina and later can share files between an iOS device and a Mac using the Finder. For the information on files sharing between iPhone and PC/iTunes, please refer to the following Apple support site.
By tapping "Setting" button, it will display the product information and the screen description. The screen description can be scrolled up and down.
- State with terminal vertically: 2 axis graph x - z, time axis y
- State with terminal in landscape orientation: 2 axis graph y - z, time axis x
- State with terminal liquid crystal facing the sky: 2 axis graph x - y, time axis z
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