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Sistema de bajo coste para medir vibraciones mediante cámaras

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TOES20140206001
Publicado:
06/03/2015
Caducidad:
15/09/2015
Resumen:
Un grupo de investigación español ha desarrollado una técnica de bajo coste para medir la frecuencia de movimientos de vibración de pequeña amplitud. Este método puede implementarse fácilmente con una videocámara de bajo coste y permite analizar simultáneamente diferentes regiones en una escena e incluso obtener un mapa de vibración de toda la escena. El método evita el uso de sondas de contacto, sistemas cableados o haces láser. Se buscan empresas interesadas en adquirir la tecnología para su explotación comercial.

Details

Tittle:
Low cost system for measuring vibrations through cameras
Summary:
A Spanish research group has developed a low-cost technique to measure the frequency of small-amplitude vibration movements.
The method can be easily implemented with a low-end video camera. It allows simultaneously analysing different regions in one scene and even obtaining a vibration map of the whole scene. It avoids using contact probes, wired systems or laser beams.
The research group is looking for companies interested in acquiring this technology for commercial exploitation.
Description:
The method is based on searching differences between successive frames and quantifying them. Frames are thresholded at multiple levels and that binary information is tracked at a small region of interest where light intensity variation due to object vibration is expected to happen.

Any movement of the object, even the smallest one, will change the scene brightness distribution and, consequently, the borders in each thresholded level of the digital image. Detection of the changed pixels provides information of movement at a sub-pixel scale. The different signals obtained for each level are composed in order to obtain a single result from the measurement.

The use of low cost cameras produces low-quality images often affected by noise. Nevertheless, the composition of the thresholded images makes the method very robust since the main vibration peak is strongly enhanced while random noise is cancelled out.

Each object is represented in a frame by a succession of illuminated pixels as Fig.1 (a). When an object is moving or vibrating, we can see a change between one frame to the next in the sequence. This change is characterized by pixels that are lighting.

In Fig.1 we can see the same object in a sequence consisting of two consecutive images and a displacement of 0.25 px.

Fig.1 (b) represents the pixelated image as would be captured by the camera. In Fig.1 (c) the same original scene shown after a displacement of 0.25 px. Note that this small displacement is perfectly noticeable by changes in the contour of the scene. These changes are indicative of the movement.

Furthermore, the accuracy to detect this movement is much less than pixel (sub-pixel accuracy because to detect a change between images is not necessary that the movement of the point representes a complete pixel.

From changes in the binarized image, if the object vibrates a pixel shift will occur with a defined pattern, so that certain pixels turn on and off at regular intervals. Performing a processing of these data can determine the vibration pattern and frequency of it.

Using a software developed by researchers, these calculations can be performed automatically. Inserting video sequence in this software can calculate the frequency of vibration of the objects filmed. This software is easily implemented on any platform and could be adapted to the required application.
Advantages and Innovations:
· Non-contact vibration measuring technique
· No need of using external elements like targets, wired devices, physical probes or optical beams
· Simple and economic setup composed of a low-end camera, and a standard computer.
· Fast and robust.
· Can measure macroscopic and microscopic vibrating objects.
· Simultaneous vibration measurement of different regions and different vibration modes (vibration map)
Stage of Development:
Prototype available for demonstration
IPs:
Patent(s) applied for but not yet granted
CommeR Statunts Regarding IPR Status:
This technology is protected by a Spanish patent application

Partner sought

Type and Role of Partner Sought:
The research group is looking for companies interested in acquiring this technology for commercial exploitation through licensing agreements or technical cooperation.

Client

Type and Size of Client:
University
Already Engaged in Trans-National Cooperation:
No
Languages Spoken:
English
French
Spanish

Keywords

Technology Keywords:
02006002 Equipos y métodos de construcción
02006005 Equipos y métodos de monitorización y mantenimiento para la construcción
01003012 Imagen, procesado de imágenes, reconocimiento de modelos
02006006 Ingeniería de la construcción (diseño, simulación)
01003008 Intercambio / procesado de datos, software personalizado
09001002 Métodos e instalaciones de ensayo / análisis
09001008 Otros ensayos no destructivos
01003016 Simulaciones
01001002 Sistemas digitales, representación digital
01003006 Software
01003007 Tecnología informática / gráficos, meta informática
09001007 Tecnología óptica relacionada con la realización de medidas