電気学会論文誌E(センサ・マイクロマシン部門誌)
Online ISSN : 1347-5525
Print ISSN : 1341-8939
ISSN-L : 1341-8939
122 巻, 6 号
選択された号の論文の9件中1~9を表示しています
特集解説
特集論文
  • 沢田 史子, 大藪 多可志, 吉田 武稔, 竹中 幸三郎, B.C. Wolverton
    原稿種別: その他
    専門分野: その他
    2002 年 122 巻 6 号 p. 300-305
    発行日: 2002年
    公開日: 2003/03/28
    ジャーナル フリー
    Plants have the capability to purify various atmospheric chemicals. There are, however, few studies on the plant purification-characteristics. In this paper, the purification capability of pothos plant for formaldehyde was investigated. Formaldehyde is one of the typical chemical substances, which cause a sick-building syndrome. The purification capability (Pa) was introduced using a tin oxide gas sensor-output. The experiment was conducted for six different soils. It is recognized that the purification capabilities considerably differ according to the kinds of soils. Namely, the soils, which are mixed with the porous materials such as ceramics, tend to have the high capability. It became obvious that room temperature had also the effects on the purification capability. The optimum temperature, at which the plant had the high capability, was about 22°C.
  • 小野寺 武, 上宮 崇, 木村 春彦, 大藪 多可志, 都甲 潔
    原稿種別: その他
    専門分野: その他
    2002 年 122 巻 6 号 p. 306-311
    発行日: 2002年
    公開日: 2003/03/28
    ジャーナル フリー
    Sick-house syndrome is caused by various types of chemical substances releasing from the building materials, and the airtight structure amplifies its disease. It is known that foliage plants has purification ability for emitted chemicals in an indoor environment. In this paper, purification process of Golden pothos for formaldehyde and emission process of formaldehyde from a piece of plywood in a chamber are measured using a tin oxide gas sensor. In the experiment, a number of potted plants that was put together with the plywood, was changed from 0 to 3. As for the results, the purification ability of a potted plant became obvious and it was recognized that the plants could purify continuously. The characteristics were analyzed and could be estimated by constructing a generating model. In the model, the purification characteristics can be predicted, when over four potted plants are installed in the chamber.
  • 山中 高夫, 中本 高道
    原稿種別: その他
    専門分野: その他
    2002 年 122 巻 6 号 p. 312-317
    発行日: 2002年
    公開日: 2003/03/28
    ジャーナル フリー
    The new type of odor recorder called real-time reference system is proposed to improve robustness against environmental changes, especially humidity and temperature changes. Since an odor sensor depends on humidity and temperature, these conditions have to be precisely controlled in a general odor sensing system. However, the odor recorder we developed in this paper does not need those requirements because of the real-time relative measurement based on the active sensing method, where a target odor and the reproduced odor were alternately exposed to the sensor array to reduce the influence of the dynamic environmental changes. We describe the design of the feedback controller for the real-time reference system and the experimental results of recording odors using the system. The recipes of apple flavors made up of four components were successfully recorded under the varying environments of humidity and temperature. Once the recipe for the target odor is recorded electronically by the odor recorder, it can be reproduced anytime and anywhere using an odor blender.
  • 小島 洋一郎, 三上 剛
    原稿種別: その他
    専門分野: その他
    2002 年 122 巻 6 号 p. 318-325
    発行日: 2002年
    公開日: 2003/03/28
    ジャーナル フリー
    In this study, ultrasonic wave acoustic properties of five basic taste solutions and marketed beverages were investigated, and the possibility of taste sensing based on the acoustical properties obtained was examined. In previous studies, properties of solutions were differentiated based on sound velocity of ultrasonic waves propagating through the solutions. However, to make this method applicable to beverages which contain many taste substances, further studies are required. In this report, the waveform of an ultrasonic wave with frequency of approximately 5 MHz propagating through a solution was measured and subjected to sound velocity, amplitude and frequency analysis. As a result, differences among solutions were clearly observed as differences in their properties. Furthermore, a self-organizing neural network was applied to obtained data which were used to clarify the differences among solutions.
論文
  • 古田 一吉
    原稿種別: その他
    専門分野: その他
    2002 年 122 巻 6 号 p. 326-331
    発行日: 2002年
    公開日: 2003/03/28
    ジャーナル フリー
    Microfactory is a novel manufacturing system, which is useful for energy saving, space saving and on-site manufacturing. We have developed the experimental Microfactory system for processing and assembling. As an example of Microfactory, the system consists of processing unit, assembling unit and conveyance unit. And the size of the system is 600mm(W) × 650mm(D) × 750mm(H). In the processing unit, a gear pattern in the diameter of 600μm, is etched and deposited by electrochemical machining on a Chromium substrate. In the conveyance unit, pallet with electromagnet, is carried by planer coils in any direction on the unit. The assembling unit consists of two micro-arms, a rotational stage and some working tools, and miniature parts assembly is accomplished in accuracy of about ±20μm. The power consumption of air conditioning of the system is advantage to the conventional system.
  • 木本 晃, 信太 克規
    原稿種別: その他
    専門分野: その他
    2002 年 122 巻 6 号 p. 332-337
    発行日: 2002年
    公開日: 2003/03/28
    ジャーナル フリー
    In this paper, temperature and ingredient of the living body model are estimated by means of the multifunctional sensing method using the piezo-electric ceramics. In this method, propagation time is measured using a pair of piezo-electric ceramics, and conductance is also measured using the electrode of the surface of the piezo-electric ceramics. As the experiment, propagation time and conductance of the living body model are measured by a pair of piezo-electric ceramics as temperature of 20°C, 25°C and 30°C. 3 types of samples which NaCl concentrations are respectively 0.1, 0.2 and 0.3 are prepared as the living body model. As a result, temperature and NaCl concentration of the model were estimated by measured values. Moreover, 3 types of samples which were different in viscosity were prepared, and temperature and viscosity were estimated by measuring the propagation time and conductance. Viscosity was changed by the concentration of TX151 which was an ingredient of the model. Therefore, the possibility of determination of temperature and the concentration of NaCl or TX151 which was the ingredient of the living body model was shown by using the proposed method.
  • 西 一樹, 安藤 繁
    原稿種別: その他
    専門分野: その他
    2002 年 122 巻 6 号 p. 338-344
    発行日: 2002年
    公開日: 2003/03/28
    ジャーナル フリー
    An optimal filter for extracting time-varying harmonics such as a voiced speech or vibration sound from the noise-corrupted observation is presented. The Wiener filter analysis to the quasi-periodic signal involving random amplitude/pitch fluctuations leads to the constant-BW/constant-Q mixed comb filter in which each pass-band located at harmonic frequencies has a constant bandwidth in lower frequency, constant-Q characteristic in higher frequency, and those mixture appears in the intermediate frequency. Some numerical examples show that the frequency response fits well the filter bank structure built in our auditory system and advantageous to separating a voiced speech from background noise
  • 尾崎 知幸, 菅原 一孔, 小西 亮介
    原稿種別: その他
    専門分野: その他
    2002 年 122 巻 6 号 p. 345-348
    発行日: 2002年
    公開日: 2003/03/28
    ジャーナル フリー
    The volatile organic compound (VOC) is contained in indoor materials in buildings, such as paints and adhesives. The formaldehyde is a representative example of the chemical substances which affect people’s health. For detection of formaldehyde, we made SnO2 thin-film type sensors by the DC magnetron sputtering method. The sensor has Pt electrodes on one side of a glass substrate as the heater. The thickness of the heater is 500 nm. The SnO2 thin film is sputtered on the opposite side of the heater. The thickness of SnO2 thin film is 200 nm. Ag(1.6 wt.%) is added as a catalyst metal. As formaldehyde is low concentration of less than 1 ppm, the output signal from sensor is buried in noise, which is generated from the heater. The noise is considered as white noise. In this paper, noise cancellation method by using Adaptive Line Enhancer(ALE) is proposed to extract the sensor outputs. The least-square method (LMS) is adopted for the adaptive algorithm in the ALE. As a result of noise cancellation by using the ALE, the formaldehyde of 0.1 ppm concentration can be detected.
feedback
Top