Device for testing traces of explosives and/or drugs
View Patent ↗An apparatus is provided for detecting whether a person has handled explosives, narcotics or other substances of interest. The apparatus includes a metallic sample collection surface on which a person may place a finger. Upon removal of the finger, the metallic sample collection surface is moved to a desorber. The desorber heats the metallic surface sufficiently to vaporize residue transferred from the person. The vaporized residue then is transmitted to a detector for analysis. The detector also may include a fingerprint reading apparatus for reading the fingerprint of the person and comparing the fingerprint to known fingerprint data.
1. An apparatus for collecting material directly from a hand of a person and for determining if the material collected from the hand contains a substance of interest, the apparatus comprising:
a housing having an access window;
a detector spaced from the access window;
a reusable sampling sheet retained within the housing and having at least one target section exposed at the access window;
a switch in proximity to the access window for generating a signal indicative of movement of the hand on the target section of the sampling sheet; and
a motor for moving the target section of the sampling sheet towards the detector so that material collected on the target section of the sampling sheet can be analyzed to determine if a substance of interest is present.
2. The apparatus of claim 1 , wherein the sampling sheet is formed from a metallic material.
3. The apparatus of claim 1 , wherein the sampling sheet is formed from a non-metallic material.
4. The apparatus of claim 1 , further comprising a desorber for selectively heating the sampling sheet adjacent the target section sufficiently for vaporizing material transferred from the hand to the sampling sheet.
5. The apparatus of claim 4 , wherein the detector is in communication with the desorber for receiving the vaporized material and analyzing the vaporized material to determine whether substances of interest are present in the material.
6. The apparatus of claim 5 , wherein the detector is an ion mobility spectrometer.
7. The apparatus of claim 5 , wherein the detector is an ion trap mobility spectrometer.
8. The apparatus of claim 1 , wherein the sampling sheet is substantially cylindrical and is secured to a disc that is rotatably mounted in the housing, the at least one target section being disposed on an outer circumferential surface of the substantially cylindrical sampling sheet.
9. The apparatus of claim 8 , wherein the housing includes a front face for facing a person whose hand is to be sampled, the disc to which the substantially cylindrical sampling sheet is secured being mounted for rotation about an axis substantially parallel to the front surface of the housing.
10. The apparatus of claim 8 , wherein the housing includes a front face for facing a person whose hand is to be sampled, the disc to which the substantially cylindrical sampling sheet is secured being mounted for rotation about an axis substantially perpendicular to the front surface of the housing.
11. The apparatus of claim 8 , wherein the substantially cylindrical sampling sheet includes a plurality of slots extending therethrough for facilitating heating and cooling.
12. The apparatus of claim 8 , wherein the switch is a pressure actuated switch.
13. The apparatus of claim 8 , wherein the switch is an electro-optical switch responsive to changes in light level as the hand is moved relative to the sampling sheet.
14. The apparatus of claim 1 , wherein the sampling sheet is a disc rotatably mounted in the housing, the disc having an outer peripheral edge, and the target section being disposed in proximity to the outer peripheral edge.
15. The apparatus of claim 1 , further comprising a fingerprint reader in proximity to the sampling sheet for reading a fingerprint of a finger placed on the target section of the sampling sheet and for generating digital signals indicative of the fingerprint.
16. The apparatus of claim 15 , further comprising a communication link for transferring the digital signals to a comparator for comparing the fingerprint to fingerprints in a database of known fingerprints and for generating a signal in response to a match between the scanned fingerprint and the fingerprint data in the database.