Modern hydraulic systems should be monitored on the regular basis. One of the most effective ways to address this task
is utilizing in-line automatic particle counters (APC) built inside of the system. The measurement of particle
concentration in hydraulic liquid by APC is crucial because increasing numbers of particles should mean functional
problems. Existing automatic particle counters have significant limitation for the precise measurement of relatively low
concentration of particle in aerospace systems or they are unable to measure higher concentration in industrial ones. Both
issues can be addressed by implementation of the CMOS image sensor instead of single photodiode used in the most of
APC. CMOS image sensor helps to overcome the problem of the errors in volume measurement caused by inequality of
particle speed inside of tube. Correction is based on the determination of the particle position and parabolic velocity
distribution profile. Proposed algorithms are also suitable for reducing the errors related to the particles matches in
measurement volume. The results of simulation show that the accuracy increased up to 90 per cent and the resolution
improved ten times more compared to the single photodiode sensor.
This paper describes the processing methods of signal obtained from the CMOS matrix sensor in terms of its
implementation for the in-line automatic particles counters. The methods involve an analysis of particles' tracks in terms
of its shapes and charge accumulated by each pixel. This combination gives an opportunity to determine an equivalent
diameter of particles and their shapes. These methods can be implemented using digital signal processors, which is very
important in the area of developing and producing the built into hydraulic systems sensors. The primary application of
developed methods is the diagnostic of the state of hydraulic systems in different areas.
Only nature can create, whereas humans can only re-create. This article is an exploration of synergies between art and science in digital holography in relation to art practice and the making of holograms as art works. This is achieved through involvement in the re-creation of a real object (a telescope) as a case study. A digital three-dimensional model suitable for holographic hard copy re-creation is produced. To explore special and immersive environment, real geographical landscape background from Google Earth is added to the model. After a brief introduction to visual art within the context of two and three-dimensional imaging in the form photography and holography, the whole process of producing the three-dimensional model and the environment in which it should be presented, ready for holographic printing is explained.
Progress has been made towards the development of a flexible true color holographic imaging device for direct optical biopsy. This can potentially be used for surgical techniques employing direct visualization, including endoscopy and laparoscopy. A novel panchromatic ‘ultrahigh precision’ recording media, with a thin layer of ultrafine grain of silver halide crystals of 10-20 nm average diameter, has been utilized. The significance of the development so far, has been the ability to emulate ‘color optical biopsy’ providing useful information of ‘medical relevance’.
Most existing holographic display methods concentrate on real object reconstruction, but there is a lack of research on object stories (revealing and presenting histories). To address this challenge, we propose a method, called 4 ‘ER’ (leader, manager, implementer, presenter) to experience and respond objects in a special immersive environment. The key innovation of the 4’ER’ method is to introduce the stories (political, historical, etc.) into hard copy holography, so as to synergy art and science for museum objects display. The hologram of an imitation of a blue and white porcelain jar from The Palace Museum, Beijing, China has been made, showing good performance and reflecting different pathway to knowledge.
This article investigates the feasibility of real-time three-dimensional imaging of microscopic objects within various emulsions while being produced in specialized production vessels. The study is particularly relevant to on-line process monitoring and control in chemical, pharmaceutical, food, cleaning, and personal hygiene industries. Such processes are often dynamic and the materials cannot be measured once removed from the production vessel. The technique reported here is applicable to three-dimensional characterization analyses on stirred fluids in small reaction vessels. Relatively expensive pulsed lasers have been avoided through the careful control of the speed of the moving fluid in relation to the speed of the camera exposure and the wavelength of the continuous wave laser used. The ultimate aim of the project is to introduce a fully robust and compact digital holographic microscope as a process control tool in a full size specialized production vessel.
Color reflection multiplex holography is an obvious target for display applications. The aim of this project is to revisit the technique of multiplex holography using modern recording and developing methods and materials. In particular, exploiting techniques of color holography that have been developed in recent years and it should be possible to extend these to high resolution multiplex holography for small and creditcard sized holograms. The current generation of holographic laser printers is not suitable for such applications as they typically employ a pixel size of around 1 mm. This report outlines progress on the production of high- resolution small-sized holographic stereograms.
Color display holography, which is the most accurate imaging technology known to science, has been used to produce
holographic images for display of artifacts in museums. This article presents the 'Bringing the Artifacts back to the
people' project. Holograms of twelve different artifacts were recorded using the single-beam Denisyuk color reflection
hologram technique. 'White' laser light was produced from three combined cw RGB lasers: a red krypton-ion laser, a
green frequency-doubled Nd-YAG laser, and an argon-ion laser. Panchromatic ultra-fine-grain silver halide materials
were used for the recording of the holograms. During 2009 the artifacts were brought to St Asaph in Wales at the Centre
for Modern Optics, to undergo holographic recording. One of the recorded artifacts included a 14,000-year-old
decorated horse jaw bone from the ice age, which is kept at British Museum in London. The recorded color holograms
of this object and others have been arranged in a touring exhibition, the 'Virtual Artifacts Exhibition.' During 2010-
2011, this will be installed in a number of local museums in North Wales and surrounding areas.