초록 ▼

A device and method for detecting fluorescent evidence, including fingerprints. The device and method use a pair of matched filters, a source of noncoherent light, and a light intensifier to detect the wavelength-shifted reflections from fluorescent substances. The light source and a first filter il

A device and method for detecting fluorescent evidence, including fingerprints. The device and method use a pair of matched filters, a source of noncoherent light, and a light intensifier to detect the wavelength-shifted reflections from fluorescent substances. The light source and a first filter illuminate the substances with a light of predetermined band width. The second filter and the light intensifier detect and increase the luminance of the reflected light, shifted to a longer wavelength by reflection from the florescent substances. The device may be hand-held and portable.

대표청구항 ▼

A portable device for detecting fingerprints without a laser by illuminating a fingerprint which has been made fluorescent, and receiving the wavelength-shifted reflections from the fluorescent fingerprint, comprising: (a) a noncoherent light source for illuminating a fingerprint; (b) a first filter

A portable device for detecting fingerprints without a laser by illuminating a fingerprint which has been made fluorescent, and receiving the wavelength-shifted reflections from the fluorescent fingerprint, comprising: (a) a noncoherent light source for illuminating a fingerprint; (b) a first filter for filtering light from said light source, said first filter having a first predetermined center wavelength between 500 and 600 nanometers; (c) a light intensifier for receiving reflections from the illuminated fingerprint and for intensifying the reflections at least several thousand times; (d) a second filter for filtering light received at said light intensifier, said second filter having a second predetermined center wavelength, said second center wavelength being separated from said first center wavelength by approximately the wavelength shift caused by reflection from the fluorescent fingerprint, and said first and second filters each having a one-half bandpass much less than said wavelength shift; and (e) means for viewing the intensified reflections so that fingerprints may be detected.