Teknologi Acoustic Tomograph Untuk Deteksi Kondisi Pohon

+Makalah-Acoustic Tomograph Untuk Deteksi Kesehatan Pohon

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News: Tree Doctor Air in RRI Thursday, January 15, 2015

Tree Doctor Air in RRI Thursday, January 15, 2015
http://news.ipb.ac.id
Posted by admin on 19 January 2015
The tragedy of the falling tree that has recently caused human deaths in Bogor Botanical
Gardens becomes a concern of many parties, including Bogor Agricultural University (IPB). “I
personally feel concerned over and express condolences for the victims,” said a researcher
of Department of Forest Products, Faculty of Forestry, Dr. Lina Karlinasari in a broadcast on
RRI Bogor, Jln Pangrango, Tuesday (13/1). The live broadcast hosted by broadcaster
Hadiyanto Lulu was also attended by the Director of Research and Innovation Prof. Dr.
Iskandar Z. Siregar.
Dr. Lina said, such a disaster could have been avoided if we had examined the tree. Checking
of a tree condition is to determine its health or damage, maintain its condition, anticipate its
potential fall or collapse, and estimate the strength properties of wood in the tree.
Check-up of a tree condition can be done in two ways: namely visually and by using
technology. The first method is the most basic, simplest, and most common activities to
determine the health, damage, and fitness of a trees. It is directed to identify and assess signs
and symptoms existing in the tree.
Visual examination is conducted on all parts of the tree starting from roots, main stems,
branches, leaves, and canopy. This also includes an evaluation of surrounding environment
where the tree is growing. However, it has limitations; among others, it can not predict the
inside condition of the tree stem.
The use of technology refers to a non-destructive testing / evaluation (NDT / NDE). The NDT
technology commonly used to detect the condition of the tree is based on the speed of sound
wave propagation (acoustic) and resistance drilling. The principle of acoustic-based
technology is that sound waves are propagated into a material, on which the sound would
travels faster through solid wood (intact) compared to rotten wood. The technology currently
developed is the acoustic tomography technology, known as sonic tomography.
Sonic Tomography is used to determine the inner condition of a tree based on the colored
image resulting from the velocity matrix of the sound waves propagating in the inside of the
wood. Resistance drilling technology is for displaying wood density changes associated with
the damage to the inside of wood. Changes in amplitude on the graph in the instrument shows
the variation of wood density due to the decays and cracks on the inside of the tree. NDT
technology is recommended to predict the internal condition of the tree which is often
undetected through the visual evaluation. (Mtd).
Link: http://news.ipb.ac.id//news/en/02a2bddb96007a32280741c3e8428cfa/tree-doctor-air-in-rri-thursday-january-15-2015.html
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Artikel: EVALUASI VISUAL DAN KARAKTERISTIK KECEPATAN GELOMBANG ULTRASONIK POHON PENEDUH DI PERKOTAAN DAN HUTAN TANAMAN

Abstract

In urban areas, trees provide aesthetic and comfort value, as well as a part of the history of the city and human civilization. The environmental stresses have led to a hazard trees. It can be harmful to humans due to falling or collapse suddenly. In other things, healthy living trees at plantation forest have been greatly impact on wood productivity. This article reports the results of a study using NDT technology based on ultrasonic wave propagation combining visual observation in urban trees and plantation forest. Most of tree planted as shade trees in urban area of Bogor and district of south Jakarta were mahagony (mahoni) mahogany (Swietenia sp.) and pterocarpus (angsana) angsana (Pterocarpus sp). The deterioration symptoms that appear in trees were open hollow, lianas and epiphytes attack, decay and death of bark, as well as termite attack. The healthy living trees in Bogor reached 50% with the ultrasonic wave velocity above 1200 m/sec. In opposite, more than 50% trees were in unhealthy condition with ultrasonic wave speeds below 800 m/sec at south Jakarta district. At plantation forest, more than 90% trees were in healthy standing trees as indicted with ultrasonic wave velocity value of above 1200 m/sec.

Keywords:     living tree, urban trees, ultrasonic velocity, visual assessment, NDT

Unduh Artikel

Reference:

Karlinasari, L, IL Maryanti, HN Batubara, RM Dhani, D Nandika. 2012. Evaluasi Visual dan Karakteristik Kecepatan Gelombang Ultrasonik Pohon Peneduh Di Perkotaan dan Hutan Tanaman (Visual Evaluation and Ultrasonic Wave Velocity Characteristics of Shade Trees in Urban Area and Plantation Forest). Jurnal Ilmu dan Teknologi Hasil Hutan. Vol. 5 (2): 40-46.

 

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Catatan Singkat: Teknologi Deteksi Kerusakan dan Kesehatan Pohon

Teknologi Deteksi Kerusakan dan Kesehatan Pohon

  • Oleh: Dr. Lina Karlinasari, S.Hut.MSc.F.
  • Divisi Rekayasa dan Desain Bangunan Kayu, Departemen Hasil Hutan, Fakultas Kehutanan IPB

Sonic TomographyPohon mememiliki peranan yang sangat penting bagi makhluk hidup. Minimal ada ada 5 (lima) fungsi pohon yaitu untuk perbaikan iklim (climate amelioration), rekayasa lingkungan (engineering uses), produksi kayu dan non kayu, fungsi arsitektur, dan fungsi keindahan/estetika. Evaluasi kondisi pohon dilakukan dalam rangka mengetahui kesehatan atau kerusakan pohon, mempertahankan keberadaan pohon, mengantisipasi tumbang atau robohnya pohon, serta dapat digunakan untuk menduga sifat kekuatan kayu dalam pohon. Evaluasi kondisi pohon dapat dilakukan dengan 2 (dua) cara yaitu: 1). secara visual, dan 2) pemanfaatan teknologi. Evaluasi visual merupakan kegiatan dasar, paling sederhana, dan paling umum dilakukan untuk mengetahui kondisi kesehatan, kerusakan, dan kebugaran pohon. Evaluasi ini diarahkan untuk mengetahui dan menilai tanda (sign) serta gejala (sympton) yang ada pohon. Evaluasi visual dilakukan terhadap seluruh bagian pohon mulai dari kondisi perakaran, batang utama, percabangan, daun, serta tajuk; termasuk melakukan evaluasi terhadap kondisi lingkungan sekitar tempat tumbuhnya pohon. Evaluasi visual memiliki keterbatasan antara lain tidak dapat menduga kondisi bagian dalam batang pohon yang sebenarnya pada beberapa kasus. Pemanfaatan teknologi dilakukan dengan cara pengujian tidak merusak (nondestructive testing/evaluation, NDT/NDE). Teknologi NDT yang umum dilakukan untuk mendeteksi kondisi pohon adalah yang berbasis kecepatan rambatan gelombang suara (akustik) dan ketahanan pengeboran (drilling resistance). Prinsip teknologi berbasis akustik adalah dirambatkannya gelombang suara ke dalam suatu bahan, dimana suara akan merambat lebih cepat melalui kayu solid (utuh) dibandingkan dengan kayu busuk atau retak. Teknologi yang berkembang saat ini adalah teknologi akustik tomografi atau dikenal dengan sonic tomography. Sonic Tomography digunakan untuk mengetahui kondisi bagian dalam pohon berdasarkan citra (image) warna yang dihasilkan dari matriks kecepatan gelombang suara yang merambat di bagian dalam kayu. Contoh Hasil Tomograph

Teknologi drilling resistance berguna untuk menampilkan perubahan kepadatan kayu terkait dengan adanya kerusakan pada bagian dalam kayu. Perubahan amplitudo pada grafik di alat menunjukkan variasi kepadatan kayu akibat adanya pembusukan dan retak pada bagian dalam pohon. Penggunaan teknologi NDT direkomendasikan untuk menduga kondisi internal pohon yang seringkali pada evaluasi visual tidak terdeteksi kerusakan bagian dalam pohonnya.

-o0o-

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Article: Near infrared (NIR) spectroscopy for estimating the chemical composition of Acacia (Acacia mangium Willd.)

Abstract. Research on wood technological properties using near infrared (NIR) spectroscopy has shown promising results. The aim of this study was to evaluate the efficiency of NIR spectroscopy for estimating chemical properties of mangium wood (Acacia mangium). NIR spectra were obtained from 150 wood meal samples of mangium trees that were 5–7-years-old. A multivariate data analysis method of partial least squares was used to develop calibration regression models for predicting chemical properties based on NIR spectra. The results showed a good relationship between values derived from laboratory analyses and those predicted by NIR spectroscopy for a-cellulose and hemicellulose content. The calibration models had high values for the coefficient of determination (R2> 0.80) and the ratio of performance to deviation (RPD > 2.0). Meanwhile, lignin and extractive content were poorly predicted; calibration validation revealed R2< 0.60 and RPD = 1.0. This study indicated that NIR spectroscopy analysis on wood meal of A. mangiumcould be reliably used to predict a-cellulose and hemicellulose.

Keywords: Near infrared (NIR),Acacia mangium, Wood meal, Partial least squares (PLS)

Reference:

Karlinasari L, M Sabed, INJ. Wistara, YA Purwanto.2014. Near infrared (NIR) spectroscopy for estimating the chemical composition of Acacia (Acacia mangium Willd.) wood. Journal of the Indian Academy Wood Science. Vol. 11(2): 162-167.

 

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Article: Reliability of sonic tomography to detect agarwood in Aquilaria microcarpa Baill.

Abstract. Gaharu, or agarwood, is a valuable nontimber forest product. Due to its economic value, agarwood has been subjected to overexploitation in Indonesia’s natural forests. The traditional practice for harvesting agarwood is to fell trees without any reliable techniques for predicting that agarwood is present. Sonic tomography may represent a technique to detect agarwood in a tree before felling it. A study was conducted to evaluate the reliability of sonic tomography (Picusâsonic tomography) to detect agarwood within Aquilaria microcarpa trees. Thirty-five A. microcarpatrees (diameter ³15 cm) at an experimental forest area in Carita, Banten Province, were selected as sample trees. Four to six transducers were placed at measuring points around the trunks of sample trees at 20, 130, and 200 cm from the ground. The transducers were connected to a software system that could record sonic wave velocities within each sample tree and then convert the data into colored images. The results showed that sound wave velocities within sample trees ranged from 400 to 900 m/s with average value 700 m/s. There were no significant differences of sonic wave velocities among measuring points. Sample trees with high sonic velocity tended to have dark-colored tomographic images (dark brown), while the lower sonic velocities were denoted by light colors (green, violet, blue). These results respectively corresponded to healthy and deteriorated conditions of the sample trees. In conclusion, sonic tomography shows sufficient reliability.

Keywords: Agarwood  Aquilaria microcarpa  Sonic tomography  Sonic wave velocity

Reference:

Indahsuary N, D. Nandika, L. Karlinasari, E. Santoso. 2014. Reliability of sonic tomography to detect agarwood in Aquilaria microcarpa Baill. Journal of the Indian Academy Wood Science. 11(1): 65-71. ISSN 0972X; DOI 10.007/s13196-014-0119-x)

http://link.springer.com/article/10.1007%2Fs13196-014-0119-x#page-1

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Tree Checking in Jakarta Using Sylvatest Duo

Pohon-pohon di Jakarta Diperiksa

Bagus Novianto dan Yuli Sasmito

02/02/2012 12:13
Liputan6.com, Jakarta: Pohon-pohon tua yang tumbuh di Jakarta kembali diperiksa Tim Dinas Pertamanan DKI Jakarta. Pemeriksaan dilaksanakan untuk mengetahui ketahanan pohon-pohon di ibukota menghadapi kemungkinan turunnya hujan lebat dan angin kencang dalam waktu dekat.Pemeriksaan pohon, Kamis (2/2) dimulai dari depan Balai Kota DKI Jakarta. Tim Dinas Pertamanan DKI Jakarta bekerja sama dengan ahli kehutanan Institut Pertanian Bogor dengan menerapkan sejumlah prosedur untuk menentukan kekuatan pohon-pohon di ibukota.Peralatan ultrasonik yang digunakan mampu menunjukkan kekuatan pohon tanpa merusak batang pohon.”Jadi pada prinsipnya seluruh alat untuk mengevaluasi pohon, umumnya berbasis gelombang suara,” kata Ahli Kehutanan IPB, Lina Karlinasari.Pemeriksaan digelar terutama untuk menentukan pohon-pohon mana saja yang masih bisa dipertahankan dan pohon-pohon mana saja yang sudah layak ditebang.”Dari situ bisa kita hasilkan angka-angka yang signifikan untuk menentukan sejauh mana pohon itu keropos sehingga kita bisa melakukan tindakan,” jelas Kepala Dinas Pertamanan DKI Jakarta, Catharina Suryowati.Prosedur seperti ini juga diterapkan pada pohon-pohon lain, di titik-titik strategis di Jakarta. Untuk hari ini, pemeriksaan juga dilakukan di Jalan Pattimura dan Teuku Umar. Memasuki tahun 2012, sudah lebih dari 150 pohon ditebang Dinas Pertamanan DKI, mencegah pohon-pohon tersebut tumbang di saat datang angin kencang.(MEL)

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