Spectrofluorimeter
First Claim
1. A spectrofluorimeter for detecting intensity of luminescence at various wavelengths emitted by a sample under test, which comprises a sample station whereat a sample may be located at a predetermined location, a flash or pulsed source of light, including a plasma discharge lamp, arranged to produce exciting radiation over a continuous range of wavelengths and emit radiation with intermittent intensity peaks at a desired frequency, an excitation monochromator located between the source and the sample station for transmitting radiation at a selected wavelength towards the sample, a first optical system arranged to focus light from the excitation monochromator at the sample station, means located in the radiation path between the excitation monochromator and the sample station to direct a reference beam of radiation to a reference radiation detector and thereby provide a correction signal for fluctuations in light intensity from the source, an emission monochromator arranged to receive luminescence from the sample under test via a second optical system and transmit radiation at a selected wavelength towards a detection system, stepping motors coupled to respective monochromators for varying the wavelength of radiation transmitted by the monochromators, the detection system including a photomultiplier responsive to the radiation transmitted by the emission monochromator and arranged to provide a signal dependent on the intensity of luminescence at the wavelength transmitted by the emission monochromator, and the first and second optical systems being corrected for spherical and chromatic aberrations.
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Abstract
A spectrofluorimeter for measuring excitation and emission spectra uses a flash or pulsed light source, an excitation monochrometer adjustable by a stepping motor, a first optical system for directing radiation onto a sample under test, a reference light detector for monitoring the excitation radiation, an emission monochrometer, also adjustable by a stepping motor, for receiving radiation via a second optical system from the sample and directing selected wavelengths to a detection photomultiplier, the first and second optical systems being corrected for spherical and chromatic alterations.
34 Citations
11 Claims
- 1. A spectrofluorimeter for detecting intensity of luminescence at various wavelengths emitted by a sample under test, which comprises a sample station whereat a sample may be located at a predetermined location, a flash or pulsed source of light, including a plasma discharge lamp, arranged to produce exciting radiation over a continuous range of wavelengths and emit radiation with intermittent intensity peaks at a desired frequency, an excitation monochromator located between the source and the sample station for transmitting radiation at a selected wavelength towards the sample, a first optical system arranged to focus light from the excitation monochromator at the sample station, means located in the radiation path between the excitation monochromator and the sample station to direct a reference beam of radiation to a reference radiation detector and thereby provide a correction signal for fluctuations in light intensity from the source, an emission monochromator arranged to receive luminescence from the sample under test via a second optical system and transmit radiation at a selected wavelength towards a detection system, stepping motors coupled to respective monochromators for varying the wavelength of radiation transmitted by the monochromators, the detection system including a photomultiplier responsive to the radiation transmitted by the emission monochromator and arranged to provide a signal dependent on the intensity of luminescence at the wavelength transmitted by the emission monochromator, and the first and second optical systems being corrected for spherical and chromatic aberrations.
Specification