WordNet
- a measuring instrument for determining optical or photographic density
PrepTutorEJDIC
- (写真現像の)濃度計
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出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2015/01/10 09:27:55」(JST)
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- Not to be confused with hydrometer which measures mass density of liquids.
Heiland Densitometer TRDZ 1
A densitometer is a device that measures the degree of darkness (the optical density) of a photographic or semitransparent material or of a reflecting surface.[1] The densitometer is basically a light source aimed at a photoelectric cell.[2] It determines the density of a sample placed between the light source and the photoeectric cell from differences in the readings.[3] Modern densitometers have the same components, but also have electronic integrated circuitry for better reading.[4]
Contents
- 1 Types
- 2 Applications in Photography
- 3 Uses
- 4 See also
- 5 References
- 6 External links
Types
- Transmission densitometers that measure transparent materials
- Reflection densitometers that measure light reflected from a surface.
Applications in Photography
Some modern types of German manufacture are capable of both types of measurements selectable by a switch. They are used in film photography to measure densities of negatives with the switch in the "T" (Transmission) position and the saturation of a resulting print in the "R" position. Such measurements enable the photographer to choose the right photo paper and the correct exposure, obviating experiments with test strips. Once the papers and darkroom have been calibrated, the first print from a previously measured negative is a success at once.
Uses
- Densitometers are used for measuring color saturation by print professionals
- Calibration of printing equipment
- It serve as one of the Molecular tools for gene study, to quantify the radioactivity of a compound such as radiolabeled DNA.
- They are also used for making adjustments so that outputs are consistent with the colors desired in the finished products.
See also
- Densitometry
- Microdensitometer
- Spectrophotometer
- Molecular tools for gene study
References
- ^ "301 Medical Densitometer - Black & White Film Measuring". X-Rite. Retrieved 2014-08-23.
- ^ "Unbound MEDLINE : An evaluation of a rotating drum densitometer and its application to precession photographs of protein crystal". Unboundmedicine.com. Retrieved 2014-08-23.
- ^ Health Physics Division annual progress report - Oak Ridge National Laboratory. Health Physics Division, Union Carbide Corporation, U.S. Atomic Energy Commission, United States. Energy Research and Development Administration, United States. National Bureau of Standards. Fracture and Deformation Division, United States. Dept. of Energy. Office of Fusion Energy, United States. National Bureau of Standards - Google Books. Books.google.co.uk. Retrieved 2014-08-23.
- ^ Industrial Instrumentation & Control,2e - S. K. Singh - Google Books. Books.google.de. Retrieved 2014-08-23.
External links
- In depth article explaining densitometers
UpToDate Contents
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English Journal
- Relationships between vertebral fractures, sex hormones and vitamin D in Moroccan postmenopausal women: a cross sectional study.
- El Maataoui A1,2, El Maghraoui A3,4, Biaz A5, Elmachtani SI6,7, Dami A8,9, Bouhsain S10,11, Mounach A12,13, Chabraoui L14,15, Ouzzif Z16,17.
- BMC women's health.BMC Womens Health.2015 May 13;15(1):41. doi: 10.1186/s12905-015-0199-9.
- BACKGROUND: Vertebral Fractures (VFs) are associated with bone loss that occurs before menopause but is accelerated at menopause as a result of sex hormone deficiency. To determine the association of sex hormones, bone remodeling markers and vitamin D levels with bone mineral density (BMD) and asymp
- PMID 25968889
- III-5 Improved Bone Strength With Low-Frequency and Low-Intensity Pulsed Ultrasound (LIPUS) in Osteoporotic Women.
- Okuizumi H1, Kurosawa K, Koyano K, Kamide N, Seyano A.
- Journal of orthopaedic trauma.J Orthop Trauma.2015 May;29(5):S5-6. doi: 10.1097/01.bot.0000462964.48225.c0.
- OBJECTIVE: We examined whether low-intensity pulsed ultrasound (LIPUS) whose frequency was reduced from the normal level to reach distal parts for long-reach can increase bone mineral density (BMD).METHODS: Non-randomized controlled trial was conducted in elderly patients with osteoporosis living in
- PMID 25900764
- Comparison of bone mineral density changes in pediatric thalassemic patients with and without hematopoietic stem cell transplant.
- Hamidieh AA1, Mohajeri-Tehrani MR, Behfar M, Vaghari-Meher N, Alimoghaddam K, Mohseni F, Ghavamzadeh A, Larijani B, Hamidi Z.
- Experimental and clinical transplantation : official journal of the Middle East Society for Organ Transplantation.Exp Clin Transplant.2015 Apr;13(2):173-8. doi: 10.6002/ect.2014.0178. Epub 2014 Nov 12.
- OBJECTIVES: Beta thalassemia major is a genetic hemoglobin disorder that affects bone density. The disease leads to deteriorating bone structure but can be treated with hematopoietic stem cell transplant. We aimed to assess bone mineral density changes in pediatric beta thalassemia major patients wh
- PMID 25394210
Japanese Journal
- 超音波骨密度計LD-100による大腿骨近位部骨折の有無に関する判別能の検討 (骨粗鬆症の診断と治療)
- 堀井 薫,米田 勇太郎,江藤 謹司 [他]
- オステオポローシスジャパン : 日本骨粗鬆症学会雑誌 22(1), 149-154, 2014
- NAID 40019987331
- Factor Analysis of Biochemical Markers Associated with Bone Mineral Density in Adults
- Cho Jae-Hwan,Kim Min-Tae,Lee Hae-Kag,Hong In-Sik,Jang Hyon-Chol
- Journal of Physical Therapy Science 26(8), 1225-1229, 2014
- … [Subjects and Methods] From August 1 to September 15, 2013, subjects receiving medical checkups were classified as lumbar spine bone normal, osteopenic, or osteoporotic using a bone mineral densitometer. …
- NAID 130004684858
- Application of glucosylceramide based liposomes increased the ceramide content in a three-dimensional cultured skin epidermis
- 徳留 嘉寛,遠藤 麻未子,橋本 フミ惠
- Skin Pharmacology and Physiology 27(1), 18-24, 2014
- … The various extracted ceramides were separated by high-performance thin-layer chromatography and quantified by a densitometer. …
- NAID 120005520872
Related Links
- NEW PRODUCT ANNOUNCEMENT Click Here for informationon the SD4 scanning densitometer. The SD4 incorporates Windows® as the operating system and ...
- Reduce waste, production time and get color right the first time, every time with X-Rite’s wide range of versatile densitometers and spectrodensitometers. ... A pressroom densitometer—the traditional and, until recently, the most ...
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- 英
- densitometer
- 関
- デンシトメータ、濃度計