Glossary entry (derived from question below)
Spanish term or phrase:
objeto puntual
English translation:
single point object
Added to glossary by
Laura Gómez
Jun 9, 2015 17:32
8 yrs ago
1 viewer *
Spanish term
Spain
Reliable and fast
Native in: Galician 
, Spanish
Works in: English to Spanish, French to Spanish, Portuguese to Spanish, and 9 more.
objeto puntual
Spanish to English
Science
Science (general)
Hola
se trata de un programa de la asignatura de "Óptica fisiológica".
Contexto: Objeto puntual: diámetro del círculo de difusión.
Muchas gracias
se trata de un programa de la asignatura de "Óptica fisiológica".
Contexto: Objeto puntual: diámetro del círculo de difusión.
Muchas gracias
Proposed translations
(English)
| 4 | point object |
Thomas Walker
|
| 4 +2 | punctual object |
Mónica Belén Colacilli
|
| 4 +2 | image point |
neilmac
|
| 4 | specific object |
Henry Hinds
|
Proposed translations
2 days 6 hrs
Selected
point object
The "point object" is a concept used in various branches of optics; it is a (true) particle, in the sense that it is an object that has no extension, it is an object that is just a geometric point. The point object does not exist in the real word - all objects have extension, they are bigger than just one single point.
Example sentence:
These complications can be avoided by considering the motion of a very small body called a particle or a point object.
The concept of a particle or a point object is very useful because real objects often behave to a great extent, like particles.
4 KudoZ points awarded for this answer.
Comment: "Thanks a lot, Tom"
+2
11 mins
Mónica Belén Colacilli
Argentina
Argentina
Native in Spanish
Works in field
Argentina
Translator since 2003, Medicine Student
Native in: Spanish (Variants: Argentine, Latin American) 
Works in: English to Spanish, Spanish to English, Spanish
punctual object
Hola Laura.
En óptica, sería así. Pego algunas referencias:
http://www.google.com/patents/WO2011018678A1?cl=en
https://www.osapublishing.org/abstract.cfm?uri=ecbo-2003-514...
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Note added at 22 minutos (2015-06-09 17:54:44 GMT)
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1. Introduction
The optical systems that are constructed with conventional lens have limited depth of field and only
the regions that are inside of depth of field (DOF) will appear in focus in the final image. Thus the
regions of the object surface that are out of DOF will appear out of focus on the acquired image.
Physical optics establishes that the diffraction pattern diameter of pupil imaging system defines the
DOF of the imaging system. The diameter of this central spot, in experimental situations is of the
order of tenths of a micron, while that the digital cameras have micro-sensor dimensions of some
microns. Thus, diffraction-related effects as predicted by physical optics are not significant, since the
spatial resolution of most sensor arrays is quite below that of the diffraction limit. It implicates that the
geometrical optics defines the depth of field of a digital imaging system like CCD or CMOS.
According to geometrical model of thin lenses, if the sensor plane does not coincide with the focal
plane, the image of a punctual object will be a circle for a circular pupil of the imaging system and
known as circle of confusion. The diameter of the circle confusion is calculated from the parameters of
the optical system and the defocus distance, displacement from sensor plane to focal plane. Thus, the
PSF can be approximated to a cylindrical function of brightness constant, filtering high frequency
information. However, due to lens aberrations, diffraction and noise, the brightness decreases
gradually to brim.
http://iopscience.iop.org/1742-6596/274/1/012040/pdf/jpconf1...
En óptica, sería así. Pego algunas referencias:
http://www.google.com/patents/WO2011018678A1?cl=en
https://www.osapublishing.org/abstract.cfm?uri=ecbo-2003-514...
--------------------------------------------------
Note added at 22 minutos (2015-06-09 17:54:44 GMT)
--------------------------------------------------
1. Introduction
The optical systems that are constructed with conventional lens have limited depth of field and only
the regions that are inside of depth of field (DOF) will appear in focus in the final image. Thus the
regions of the object surface that are out of DOF will appear out of focus on the acquired image.
Physical optics establishes that the diffraction pattern diameter of pupil imaging system defines the
DOF of the imaging system. The diameter of this central spot, in experimental situations is of the
order of tenths of a micron, while that the digital cameras have micro-sensor dimensions of some
microns. Thus, diffraction-related effects as predicted by physical optics are not significant, since the
spatial resolution of most sensor arrays is quite below that of the diffraction limit. It implicates that the
geometrical optics defines the depth of field of a digital imaging system like CCD or CMOS.
According to geometrical model of thin lenses, if the sensor plane does not coincide with the focal
plane, the image of a punctual object will be a circle for a circular pupil of the imaging system and
known as circle of confusion. The diameter of the circle confusion is calculated from the parameters of
the optical system and the defocus distance, displacement from sensor plane to focal plane. Thus, the
PSF can be approximated to a cylindrical function of brightness constant, filtering high frequency
information. However, due to lens aberrations, diffraction and noise, the brightness decreases
gradually to brim.
http://iopscience.iop.org/1742-6596/274/1/012040/pdf/jpconf1...
Peer comment(s):
| neutral |
philgoddard
: These are mistranslations. "Puntual" means "on time".
4 mins
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Hi Phil, you may be right in a general context.
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| neutral |
neilmac
: I only respect the Collins reference, but even so, I still would rather not use "punctual", due to its widespread misuse as a false friend in many fields other than optics.
5 mins
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Hola Neilmac. Te pido disculpas si te ofendí con mi comentario, no fue mi intención. Saludos.
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| neutral |
Muriel Vasconcellos
: I don't see the connection between the question and the quoted text.
3 hrs
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Hi Muriel. The quoted text is about optics, and the phrase in question is included.
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| agree |
bigedsenior
: 'punctual object' is in the text. It is a term used in Optical Science. There are a number of refs to it.
12 hrs
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Thank you!
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| agree |
Billh
: punctual: (mathematics) consisting of or confined to a point in space http://www.collinsdictionary.com/dictionary/english/punctual I have put a few more examples as dic entry - ah, so many uninformed neutrals
18 hrs
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Thanks Bill!
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45 mins
Henry Hinds
United States
United States
Native in Spanish
&
English
Works in field
United States
43 years of Border Experience and fast.
Native in: English , Spanish
Works in: English to Spanish, Spanish to English
Related KudoZ points
:
28
specific object
Ya
+2
21 mins
image point
Or "focal point".
"In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge"... (wikipedia).
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Note added at 22 mins (2015-06-09 17:54:37 GMT)
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"A principal focus or focal point is a special focus..."
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Note added at 26 mins (2015-06-09 17:58:47 GMT)
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I'm not keen on "object" in this context, either in the original text or its translation but como dice el refrán, "sobre gustos no hay nada escrito en piedra"...
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Note added at 1 day2 hrs (2015-06-10 20:29:39 GMT)
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DESPITE THE REFERENCES PROVIDED, I'd still avoid "puntual" too if possible, due to its misuse as a false friend to mean "occasional/ odd / non-linear.
"In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge"... (wikipedia).
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Note added at 22 mins (2015-06-09 17:54:37 GMT)
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"A principal focus or focal point is a special focus..."
--------------------------------------------------
Note added at 26 mins (2015-06-09 17:58:47 GMT)
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I'm not keen on "object" in this context, either in the original text or its translation but como dice el refrán, "sobre gustos no hay nada escrito en piedra"...
--------------------------------------------------
Note added at 1 day2 hrs (2015-06-10 20:29:39 GMT)
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DESPITE THE REFERENCES PROVIDED, I'd still avoid "puntual" too if possible, due to its misuse as a false friend to mean "occasional/ odd / non-linear.
Peer comment(s):
| agree |
EirTranslations
7 hrs
|
| agree |
Neil Ashby
: https://en.wikipedia.org/wiki/Circle_of_confusion In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source.
15 hrs
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Discussion
NB: If you compare the definition you posted, you will see it actually fits my suggestion (image point) like a glove.
Gérard René Lemaitre - 2008 - Science
Active Optics Methods Gérard René Lemaitre. Examples of ... In astronomy, this facilitates the detection of a faint object when close to a bright punctual object.
www.google.com/patents/WO2011018678A1?cl=en
17 Feb 2011 - In an optical system having an optical center O, a punctual object A has an image which is also punctual. The object, the image and the optical ...
www.sbf1.sbfisica.org.br/.../pdfs optics/... Holography and...
Practical application of optical systems can be limited by spherical aberration effects, ... nonparaxial rays originated from a punctual object, located on the optical ...
https://spie.org/etop/1999/408_1.pdf
One of the most known methods to evaluate optical systems aberrations is the .... illuminated area on the screen device acts as a punctual object placed at a ...
http://www.collinsdictionary.com/dictionary/english/punctual
(mathematics) consisting of or confined to a point in space
puntual RAE
...
5. adj. Perteneciente o relativo al punto.
6. adj. Fís. Que se considera como originado o situado en un punto.