sllu@jenny.isi.edu (Shih-Lien Lu) (07/21/90)
will detect UV light only (200nm to 400 nm wave length)? If not, is there any device that will detect light down to 200 nm wave length? Thank you in advance. Shih-Lien Lu
ftpam1@acad3.fai.alaska.edu (MUNTS PHILLIP A) (07/21/90)
In article <14380@venera.isi.edu>, sllu@jenny.isi.edu (Shih-Lien Lu) writes... >will detect UV light only (200nm to 400 nm wave length)? >If not, is there any device that will detect light down to 200 nm wave >length? >Thank you in advance. > > >Shih-Lien Lu Photomultiplier tubes (possibly with optic filtering). High voltage (> 1 KV) and big bucks ($$$). Manufacturers include RCA and Hammatsu. Sorry I don't have addresses available; my databooks are in storage some 3000 Km southeast. Philip Munts N7AHL NRA Extremist, etc. University of Alaska, Fairbanks
whit@milton.u.washington.edu (John Whitmore) (07/21/90)
In article <1990Jul21.023806.12927@hayes.fai.alaska.edu> ftpam1@acad3.fai.alaska.edu writes: >In article <14380@venera.isi.edu>, sllu@jenny.isi.edu (Shih-Lien Lu) writes... >>will detect UV light only (200nm to 400 nm wave length)? >>If not, is there any device that will detect light down to 200 nm wave >>length? > > Photomultiplier tubes (possibly with optic filtering). Or perhaps simple photocells. The bias voltage on a photomultiplier (PMT) tube's first cathode can be deliberately degraded (run low) so that only energetic photons (UV) generate electrons... this is the 'photoelectric effect' that Einstein got his Nobel for explaining. Photocells, while having MUCH lower currents, are easier to bias. Look up 'stopping potential' in any discussion of photoelectricity. John Whitmore
kgreer@mcnc.org (Ken Greer) (07/22/90)
In article <14380@venera.isi.edu> sllu@ISI.EDU (Shih-Lien Lu) writes: >will detect UV light only (200nm to 400 nm wave length)? >If not, is there any device that will detect light down to 200 nm wave >length? I think this is the very same project shown in this month's Scientific American. I don't still have it, but take a look. There was (is) a project, with parts sources, for people to figure out how much UV is measureable, so presumably you can get some data to predict the end of the ozone layer and the end of life on the planet. It mentioned the use of some filters, too, and sources for them. Kim -- Kim L. Greer try: klg@orion.mc.duke.edu Duke University Medical Center kgreer@mcnc.org Div. Nuclear Medicine POB 3949 klg@dukeac.ac.duke.edu Durham, NC 27710 919-660-2711x5223 fax: 919-681-5636