Optimally Overlapped Ultrasonic Sensor Ring for Minimal Positional Uncertainty and Maximal Detection Range

ABSTRAKPada penelitian ini, modul ultrasonik dimanfaatkan dalam sebuah sistem bel otomatis sederhana. Sistem ini didesain untuk mempermudah pengunjung yang kesulitan menekan bel rumah konvensional, misalnya anak-anak dan penyandang cacat. Tujuan dari penelitian ini adalah mengevaluasi jarak optimal obyek secara vertikal dan horizontal di depan pintu agar dapat mengaktifkan bel secara otomatis. Sistem ini terdiri atas tiga unit yaitu modul ultrasonik HC-SR04, modul pengolah data berbasis mikrokontroler dan modulbuzzer elektromagnetik. Sistem ini beroperasi dengan mendeteksi keberadaan pengunjung menggunakan sensor ultrasonik; saat pengunjung berada dalam jangkauan sensor, maka bel akan berbunyi selama lima detik sebelum memasuki kondisi diampada lima detik selanjutnya untuk mengurangi bunyi berulang selama tamu belum memasuki rumah. Untuk menguji kinerja sistem, bel otomatis dipasang pada kusen dengan kemiringan antara 15 hingga 20 derajat dari pintu daun pintu. Berdasarkan hasil pengujian, dapat disimpulkan bahwa sistem bel otomatis dapat berfungsi saat mendeteksi pengunjung dengan tinggi minimum 101cm (secara vertikal) dan pada jarak rata-rata 45,33 cm dari pintu (secara horizontal).Kata kunci: bel rumah, otomatis, penyandang cacat, sensor ultrasonik. ABSTRACTIn this research, ultrasonic module is used to develop a simple automatic doorbell system. The system was implemented to help some visitors who are difficultto press a switch of conventional doorbell, such as a child and a disabled people. The aim of this study is to evaluate an optimal vertical and horizontal distance of an object in front of the door where can activate the doorbell system automatically. There are three main modules to implement the system i.e. ultrasonic sensor module; microcontroller based processing unit module; and buzzer module. The sensor module, which installed in the upper side of a door frame with approximately 15 to 20 degrees angle from the door, detects the distances of visitor. The buzzer module will active for five seconds when the visitor in the detection range of the sensor. The results showed that the buzzer module will be active when the sensor detected an object with 101 cm of minimum height (vertically) and 45.33 cm of average distance from the door (horizontally).Keywords: automatic, doorbell system, ultrasonic sensor, disabled people

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Optimally overlapped ultrasonic sensor ring with minimal positional uncertainty in obstacle detection

ICCAS 2010 ◽

10.1109/iccas.2010.5669939 ◽

2010 ◽

Author(s):

Sungbok Kim ◽

Hyun Bin Kim

Keyword(s):

Obstacle Detection ◽

Ultrasonic Sensor ◽

Positional Uncertainty

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Seti Figure of Merit

International Astronomical Union Colloquium ◽

10.1017/s0252921100015293 ◽

1997 ◽

Vol 161 ◽

pp. 711-717 ◽

Cited By ~ 1

Author(s):

John W. Dreher ◽

D. Kent Cullers

Keyword(s):

Figure Of Merit ◽

Qualitative Difference ◽

Current Generation ◽

Detection Range ◽

Sky Surveys ◽

Independent Observations ◽

Good For

AbstractWe develop a figure of merit for SETI observations which is anexplicitfunction of the EIRP of the transmitters, which allows us to treat sky surveys and targeted searches on the same footing. For each EIRP, we calculate the product of terms measuring the number of stars within detection range, the range of frequencies searched, and the number of independent observations for each star. For a given set of SETI observations, the result is a graph of merit versus transmitter EIRP. We apply this technique to several completed and ongoing SETI programs. The results provide a quantitative confirmation of the expected qualitative difference between sky surveys and targeted searches: the Project Phoenix targeted search is good for finding transmitters in the 109to 1014W range, while the sky surveys do their best at higher powers. Current generation optical SETI is not yet competitive with microwave SETI.

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АКУСТИЧНА ПОМІТНІСТЬ БЕЗПІЛОТНИХ ЛІТАЛЬНИХ АПАРАТІВ З СИЛОВИМИ УСТАНОВКАМИ НА БАЗІ ПОРШНЕВИХ ДВИГУНІВ

Open Information and Computer Integrated Technologies ◽

10.32620/oikit.2020.88.05 ◽

2020 ◽

pp. 62-80

Author(s):

В. В. Руденко ◽

И. В. Калужинов ◽

Н. А. Андрущенко

Keyword(s):

Control System ◽

Internal Combustion Engine ◽

Power Plants ◽

Combustion Engine ◽

Spectral Characteristics ◽

Experimental Studies ◽

Internal Combustion ◽

Detection Range ◽

Acoustic Signature ◽

Static Conditions

The presence in operation of many prototypes of UAVs with propeller propellers, the use of such devices at relatively low altitudes and flight speeds makes the problem of noise reduction from UAVs urgent both from the point of view of acoustic imperceptibility and ecology.The aim of the work is to determine a set of methods that help to reduce the visibility of UAVs in the acoustic range. It is shown that the main source of noise from the UAV on the ground is the power plant, which includes the engine and the propeller. The parameters of the power plants influencing the processes that determine the acoustic signature of the UAV were investigated. A comprehensive analysis of the factors affecting visibility was carried out. The power plants include two-stroke and four-stroke engines, internal combustion and two-blade propellers. The use of silencers on the exhaust of the internal combustion engine was considered. The spectral characteristics of the acoustic fields of the propeller-driven power plants for the operating sample of the UAV "Eco" were obtained. The measurements were carried out in one-third octave and 1/48 octave frequency bands under static conditions. The venue is the KhAI airfield. Note that the propellers that were part of the power plants operated at Reynolds numbers (Re0,75<2*105), which can significantly affect its aerodynamic and acoustic characteristics. It is shown that when choosing a UAV control system, one should take into account the fact that two-stroke piston engines are the dominant source in the noise of propeller-driven control systems in the absence of a hood and mufflers in the intake and exhaust tracts. The use of a four-stroke internal combustion engine significantly reduces the noise of the control system. In the general case, the position of the boundaries of the zone of acoustic visibility of a UAV at the location of the observer is determined by the ratio between the intensity of acoustic radiation perceived by the observer from the UAV and the intensity of sound corresponding to the natural acoustic background and depends on the degree of manifestation of acoustic effects accompanying the propagation of sound in a turbulent atmosphere - the refraction of sound waves. Absorption and dissipation of acoustic energy. The calculation and comparison of the UAV detection range was carried out taking into account the existing natural maskers.The results of experimental studies are presented that allow assessing the degree of acoustic signature of the UAV. A set of measures aimed at reducing the intensity of the acoustic signature of the UAV in various regions of the radiation spectrum has been determined.

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Rancang Bangun Sistem Monitoring Pengukuran Volume Air Berbasis IoT Menggunakan Arduino Wemos

Journal CERITA ◽

10.33050/cerita.v6i2.1136 ◽

2020 ◽

Vol 6 (2) ◽

pp. 147-153

Author(s):

Muhamad Yusup ◽

Po. Abas Sunarya ◽

Krisandi Aprilyanto

Keyword(s):

Waste Water ◽

Waste Water Treatment ◽

Water Reservoir ◽

Ultrasonic Sensor ◽

Automated System ◽

Volume Formula ◽

Air Volume ◽

Database Server ◽

A Company ◽

Height Data

System The process of counting and storing in a manual water reservoir analysis has a high percentage of error rate compared to an automated system. In a company industry, especially in the WWT (Waste Water Treatment) section, it has several reservoir tanks as stock which are still counted manually. The ultrasonic sensor is placed at the top of the WWT tank in a hanging position. Basically, to measure the volume in a tank only variable height is always changing. So by utilizing the function of the ultrasonic sensor and also the tube volume formula, the stored AIR volume can be monitored in real time based on IoT using the Blynk application. From the sensor, height data is obtained which then the formula is processed by Arduino Wemos and then information is sent to the MySQL database server via the WIFI network.

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