The FLIR Si124 acoustic imaging camera can help you locate pressurized leaks in compressed air systems or detect partial discharge from high-voltage electrical systems. This lightweight, one-handed solution can be used to identify issues up to 10 times faster than with traditional methods. Built with 124 microphones, the Si124 produces a precise acoustic image that visually displays ultrasonic information, even in loud industrial environments. The acoustic image is transposed in real time on top of a digital camera picture, which allows you to accurately pinpoint the source of the sound. The Si124 features a plugin that enables users to import acoustic images to FLIR Thermal Studio suite for offline editing, analysis, and advanced report creation. Field analysis and reporting can also be done using the FLIR Acoustic Camera Viewer cloud service. Through a regular maintenance routine, the FLIR Si124 can help facilities save money on utility bills and delay the expense of installing new compressors. Available in additional models which include a cordless battery option: the Si124-LD for leak-detection applications, or the Si124-PD for electric utility applications. View the models in the related products section below.
hydrogen ultra acoustic kit download
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Instantly detect pressurized gas leaks with this high-precision, omni-direction acoustic detector utilizing Gassonic ultrasonic technology. Works even when traditional methods of gas detection are unsuitable or dependent on ventilation. Features Artificial Neural Network (ANN) technology that distinguishes between real gas leaks and false alarm sources without requiring any in-field training. The Observer-i UGLD provides an industry-leading detection range (up to 28 m) reducing the number of detectors required. Ideal for use in complex, outdoor pipeline systems.
A wide range of sensors for hydrogen detection have been developed to date: resistive, conductometric, chemoresistive, metal-oxide semiconductor, surface acoustic wave (SAW) sensors, etc. [6,7,8,9,10]. Each of these types of sensor has advantages and disadvantages that influence important parameters such as sensitivity, limit of detection (LOD) and response time, as well as costs of production and consumption.
Surface acoustic wave sensors stand out due to their good sensitivity, satisfactory stability, possibility of wireless operation, ease of manufacture and small size [3,11,12]. They were developed both for hydrogen and for other gases such as volatile organic compounds, ammonia and other toxic and explosive substances [11,13,14]. A SAW sensor consists in a piezoelectric substrate, two pairs of interdigital transducers, and a sensitive film placed between the interdigital transducers [5,15]. Their operating principle is based on converting an electrical input into mechanical waves, which propagate over the sensitive film surface, and are subsequently converted back into an electrical signal. In the presence of the analyte at the surface of the sensitive film, a shift in the frequency of the waves occurs, due mainly to mass accumulations or acoustoelectric interactions. Thus, the nature and the type of sensitive film are very important aspects in the design of a SAW sensor for a certain type of gas [5,15].
Intensive research has been conducted on hydrogen-involved combustion instability. Matsuyama et al.10 conducted LES (large eddy simulations) on a single-element atmospheric combustor. It is found that the primary driving mechanism of 1k Hz combustion instability is the acoustically coupled pulsating motion of the inner H2/O2 flame or periodic ignition of H2/O2 mixture. Recently, Hemchandra et al.11 discovered that there are two different mechanisms driving combustion instability. One is a strong coupling between acoustics and hydrodynamic modes. The other one is a weak coupling resulting in semi-open-loop forcing of the flame by a self-sustained hydrodynamic mode. Urbano and Selle12 analyzed transverse combustion instabilities in a reduced-scale rocket motor. The interaction between acoustics and vorticity is found to be the main damping mechanism for coaxial H2/O2 flame-sustained instability. Injector-driven combustion instabilities are experimentally observed in a hydrogen/oxygen rocket motor13. The observed instabilities are a result of the interaction between the injector resonant frequencies and the combustion chamber resonant frequencies.
As the mixture of the hydrogen and air is burned, a conical shaped flame is confined in the combustor. Figure 1 shows the turbulent reaction rate as the hydrogen mass flow rate \(\dot m_\mathrmH_2\) is set to three different values. It can be seen that the flame length and the surface area are dramatically increased, and so is the heat release. As it is well known that unsteady heat release is an energy-efficient monopole-like sound source, acoustic pressure disturbances are generated with a small amplitude initially. However, whether the acoustic disturbances will grow into limit cycle pulsating combustion oscillations needs to be examined. 2ff7e9595c
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