Petri Karha
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Explore the profile of Petri Karha including associated specialties, affiliations and a list of published articles.
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Articles
12
Citations
5
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Recent Articles
1.
Haggqvist I, Karha P, Kautiainen H, Snellman E, Pasternack R, Partonen T
Photochem Photobiol Sci
. 2024 Oct;
23(11):2045-2056.
PMID: 39441451
Diurnal preference to eveningness might predispose to depression. There is preliminary evidence of infrared-A (IR-A) induced whole-body hyperthermia (WBH) in the treatment of depression. In this exploratory study with 19...
2.
Pulli T, Nevas S, El Gawhary O, van den Berg S, Askola J, Karha P, et al.
Appl Opt
. 2017 Apr;
56(11):3077-3086.
PMID: 28414366
Array spectroradiometers are attractive alternatives to scanning spectroradiometers in solar ultraviolet measurements. However, the measurement of solar spectral irradiance imposes stringent requirements for the linearity of the instruments. In this...
3.
Vaskuri A, Karha P, Heikkila A, Ikonen E
Rev Sci Instrum
. 2015 Nov;
86(10):103103.
PMID: 26520936
Polystyrene and many other materials turn yellow when exposed to ultraviolet (UV) radiation. All photodegradation mechanisms including photoyellowing are functions of the exposure wavelength, which can be described with an...
4.
Karha P, Heikkila A, Ruokolainen K, Kaunismaa M
Rev Sci Instrum
. 2011 Mar;
82(2):023107.
PMID: 21361573
A facility for exploring wavelength dependencies in ultraviolet (UV) radiation induced degradation in materials has been designed and constructed. The device is essentially a spectrograph separating light from a lamp...
5.
Shpak M, Sainiemi L, Ojanen M, Karha P, Heinonen M, Franssila S, et al.
Appl Opt
. 2010 Mar;
49(9):1489-93.
PMID: 20300142
Microbridges are miniature suspended structures fabricated in silicon. Passing a current through the microbridge can heat it up to the point of incandescence. A glowing microbridge can be used as...
6.
Poikonen T, Manninen P, Karha P, Ikonen E
Rev Sci Instrum
. 2010 Mar;
81(2):023102.
PMID: 20192480
A multifunctional setup based on the absolute integrating sphere method for measuring luminous flux of light emitting diodes (LEDs) is presented. The total luminous flux in 2pi and 4pi geometries...
7.
Ojanen M, Karha P, Ikonen E
Appl Opt
. 2010 Feb;
49(5):880-6.
PMID: 20154756
We have developed a physical model for the spectral irradiance of 1 kW tungsten halogen incandescent lamps for the wavelength range 340-850 nm. The model consists of the Planck's radiation...
8.
Manninen P, Koskela T, Ylianttila L, Karha P, Ikonen E
Opt Lett
. 2009 Oct;
34(20):3241-3.
PMID: 19838286
A straightforward method for estimating the position of the optical receiving plane of a spherical, dome-shaped diffuser from its spatial responsivity data is presented. The method is tested with two...
9.
Manninen P, Karha P, Ikonen E
Appl Opt
. 2008 Sep;
47(26):4714-22.
PMID: 18784775
The energy transfer integral between radiating rectangular and detecting circular parallel plates having nonideal angular characteristics is solved for modeling the distance dependence of the irradiance signal. The equation derived...
10.
Karha P, Jaakkola T
Rev Sci Instrum
. 2008 May;
79(4):043102.
PMID: 18447518
We present a simple modification for thermoelectrically cooled photomultiplier tube (PMT) assemblies that eliminates the magnetic interference between the peltier element and the PMT. An active compensation is accomplished by...