A Compact Excimer Lamp Constructed by Piezoelectric Transformer

Teranishi, Kenji

doi:10.2150/jlve.31.5

Cited by 12 publications

(4 citation statements)

References 18 publications

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“…Although there exist various electrode arrangements for the excitation of DBDs and their application to ozone generation, discharge plasma generation using piezoelectric transformers (PTs) [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] has been proposed by the authors and is recognized as one of the technologies that creates a discharge plasma with a compact configuration and low-voltage driving. It is also applicable to ozone generation.…”

Section: Introductionmentioning

confidence: 99%

Development of dielectric barrier discharge-type ozone generator constructed with piezoelectric transformers: effect of dielectric electrode materials on ozone generation

Teranishi¹,

Shimomura²,

Suzuki³

et al. 2009

Plasma Sources Sci. Technol.

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The dependence of ozone generation on the types of dielectric electrode material has been investigated using an ozone generator constructed with the piezoelectric transformer developed in our laboratory. The ozone generator is based on the excitation of the dielectric barrier discharge (DBD), which has the advantage of a compact configuration for generating ozone. Four kinds of dielectric materials are prepared for dielectric barrier electrodes. Electrical properties of the DBD and the ozone generation characteristics are investigated for the different dielectric materials. Differences in the discharge mode among the barrier electrode materials are recognized and discussed on the basis of the results of the Lissajous figures and voltage-current waveforms. During the continuous running of the generator, a temporal decrease in ozone concentration is observed owing to the temperature increase inside the reactor. Although the ozone generation characteristics are influenced by many properties of dielectrics, two important factors for achieving high-efficiency ozone generation are identified in this study. One is the use of a high-thermal conductivity material for the dielectric electrode, which functions well as a heat sink for transferring the generated heat to the outside through the material. The other factor is the control of the discharge mode. Our results show that the discharge mode that is considered as Townsend-like DBD is suitable for high-efficiency ozone generation.

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Section: Introductionmentioning

confidence: 99%

Development of dielectric barrier discharge-type ozone generator constructed with piezoelectric transformers: effect of dielectric electrode materials on ozone generation

Teranishi¹,

Shimomura²,

Suzuki³

et al. 2009

Plasma Sources Sci. Technol.

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“…PTs have been shown to be able to produce very large voltage gains, in some cases on the order of 10,000 (VanGordon et al, 2014). For this reason, PTs have recently garnered interest for their use in a number of different high-voltage applications, including gas discharge generation (Alonso et al, 2009), x-ray (Gall et al, 2013), and neutron generation (Gall et al, 2012), and for excimer lamps (Teranishi and Itoh, 2007). In addition, others have used gas discharges produced from PTs to treat the surfaces of materials (Kim et al, 2009), sterilize wounds (Teschke, 2009), and to build plasma reactors (Itoh et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Impingement Cooling Using the Ionic Wind Generated by a Low-Voltage Piezoelectric Transformer

Johnson

2016

Front. Mech. Eng.

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As the consumer demand for smaller, more sophisticated computers grows, the need arises for new air cooling methods that will work in geometries that mechanical fans cannot. Ionic winds (also known as electrohydrodynamic flows) are flows that are produced by the generation of a gas discharge. These flows do not require moving parts to operate, making them attractive for small form-factor devices. However, in order to produce and sustain a gas discharge in atmospheric air, very large applied voltages are required (~5 kV). Through the use of piezoelectric transformers (PTs), it is possible to generate ionic winds in ambient air with significantly smaller voltages (~7 V) than otherwise possible. When a moderate voltage is applied to a PT, discharges can form on the edges of the crystal that produce measureable ionic winds. The impingement cooling properties of these ionic winds jets on a vertical, uniformly heated metal plate were studied by measuring their induced forced convection coefficients. Using a sharpened piezoelectric crystal, a round, axis symmetric ionic wind jet was formed, and it followed similar heat transfer correlations to that of more conventional jets. The sharpened piezoelectric was able to produce convection coefficients near 50 W m −2 K −1 under the right conditions. When the piezoelectric was not sharpened, the PT produced similar convection coefficients, but cooled a larger area than its counterpart, as ionic wind jets were generated off the corners of the rectangular device.

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“…Such PTs have been in use as a high-voltage power source in cold cathode fluorescent tubes and act as a backlight source in liquid crystal displays [3,4]. Our research has been focused on the feature of a PT that can generate a high voltage on the entire surface of its secondary part by mechanical vibration [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. This high voltage can generate discharge plasma over the secondary part.…”

Section: Introductionmentioning

confidence: 99%

Hexagonal arrayed patterns with bright and dark spots observed in a compact plasma reactor based on a piezoelectric transformer

Suzuki

2014

Plasma Sources Sci. Technol.

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In this paper, we describe the formation of hexagonal arrayed patterns in a compact plasma reactor that consists of a piezoelectric transformer (PT) and a dielectric electrode. A high voltage induced on the PT surface by the piezoelectric effect generated diffuse glow-like and patterned dielectric barrier discharges (DBDs) in a gap. Vacuum ultraviolet (VUV) spectroscopy was applied to observe light emitted from Xe * 2 and Ar * 2 excimers, which were formed in a He-Xe mixture and pure Ar, respectively. Peaks at 172 and 126 nm were observed in the emission spectra. Hexagonal arrayed patterns were observed in both He and Ar by adding a small amount of air. Then, static and time-resolved images of the hexagonal arrayed patterns were captured using a single-lens reflex camera and an intensified charge-coupled device camera, respectively. The hexagonal arrayed patterns alternately exhibited bright and dark spots in weak uniform emission on the PT surface depending on the applied sinusoidal voltage. Both patterns were similar in the observed time-resolved images. Thus, it was confirmed that the observed dark spots were the traces of accumulated charges on the PT. Here, we discuss the necessary conditions for the generation of such patterns in terms of the charges accumulated on the PT and compare our results with those reported elsewhere.

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A Compact Excimer Lamp Constructed by Piezoelectric Transformer

Cited by 12 publications

References 18 publications

Development of dielectric barrier discharge-type ozone generator constructed with piezoelectric transformers: effect of dielectric electrode materials on ozone generation

Development of dielectric barrier discharge-type ozone generator constructed with piezoelectric transformers: effect of dielectric electrode materials on ozone generation

Impingement Cooling Using the Ionic Wind Generated by a Low-Voltage Piezoelectric Transformer

Hexagonal arrayed patterns with bright and dark spots observed in a compact plasma reactor based on a piezoelectric transformer

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