System for cash disinfection by applying controlled doses of ultraviolet light and methods of disinfection verification thereof

1. An apparatus, comprising:

a housing for holding a bill and comprising a bill feeder;

wherein the bill feeder comprises a bill feed motor that controls a speed with which the bill moves in the housing;

a plurality of sensors coupled to the housing and positioned to detect the bill that moves in the housing;

an ultraviolet (UV) lamp that emits ultraviolet light to illuminate a portion of the bill;

a UV shutter to control a power of the ultraviolet light on the portion of the bill;

a non-transitory computer memory; and

a processor configured to execute computer code stored in the non-transitory computer memory that causes the processor to:

receive at least one first sensor output from at least one first type sensor from the plurality of sensors;

determine at least one property of the bill based at least in part on the at least one first sensor output;

wherein the at least one property of the bill identifies at least one of:

(i) a denomination and country of issue of the bill, or

(ii) a type of material on which the bill is printed;

receive at least one second sensor output from at least one second type sensor from the plurality of sensors;

determine at least one bill contaminant that is present on the bill based at least in part on the at least one second sensor output;

retrieve from a database a UV dose rate to be applied by the ultraviolet light needed to sterilize the bill based at least in part on:

i) the at least one bill contaminant on the bill,

ii) the at least one property of the bill,

iii) an illumination area of the portion, or

iv) any combination thereof;

activate the UV lamp; and

transmit at least one instruction to at least one of the UV shutter or the bill feed motor to result in the UV dose rate to be applied to the bill to sterilize the bill that moves in the housing, the at least one instruction controlling at least one of:

(i) the UV shutter to vary the power from the UV lamp, or

(ii) the bill feed motor to control the speed with which the bill moves in the housing.

2. The apparatus according to claim 1 , wherein the at least one bill contaminant that is present on the bill modifies the UV dose rate of the bill relative to a nominal UV dose rate based only on the at least one property of the bill.

3. The apparatus according to claim 1 , wherein the processor is configured to determine the at least one property of the bill from the at least one first sensor output of the at least one first type sensor by detecting features on the bill formed from the group consisting of magnetic ink, proportions of different inks, watermarks, Intaglio printing, a security thread, a see-through register, a special foil, special foil elements, an iridescent stripe, and shifting colors.

4. The apparatus according to claim 1 , wherein the at least one bill contaminant that is present on the bill is selected from the group consisting of humidity, grease, skin oils, hand cream, glitter, and powder.

5. The apparatus according to claim 1 , further comprising a barcode reader, and wherein the barcode reader is configured to read a barcode printed on the bill using a UV sensitive ink that becomes visible when the bill receives the UV dose rate needed to sterilize the bill.

6. The apparatus according to claim 5 , wherein the processor is further configured to verify that the bill is sterilized from an output of the barcode reader when the barcode is visible.

7. The apparatus according to claim 5 , wherein the processor is further configured to verify that the bill is contaminated from an output of the barcode reader when the barcode is invisible.

8. The apparatus according to claim 1 , wherein the at least one first type sensor is a magnetic sensor, and wherein the processor is configured to determine the at least one property of the bill from an output of the magnetic sensor that senses magnetic ink used to print the bill.

9. The apparatus according to claim 1 , wherein the UV lamp emits the ultraviolet light at a UVC frequency.

10. The apparatus according to claim 1 , further comprising a bill storage tray for storing sterilized bills; wherein the processor is configured to verify that the bill is sterilized and to cause a tray selector to route the bill in the housing into the bill storage tray.

11. The apparatus according to claim 1 , further comprising a bill rejection tray for storing contaminated bills; wherein the processor is configured to verify that the bill is contaminated and to cause a tray selector from the bill feeder in the housing to route the bill in the housing into the bill rejection tray.

12. The apparatus according to claim 11 , wherein the processor is configured to verify that the bill is contaminated when contamination of the bill causes slippage of the bill in rollers of the bill feed motor.

13. The apparatus according to claim 1 , wherein the at least one second type sensor is a reflectometer, and wherein the processor is configured to determine the at least one bill contaminant that is present on the bill from an output of the reflectometer.

14. A method, comprising:

receiving in a housing comprising a bill feeder, a bill for sterilization;

wherein the bill feeder comprises a bill feed motor that controls a speed that the bill moves in the housing;

wherein a plurality of sensors is coupled to the housing and positioned to detect the bill that moves in the housing;

receiving, by a processor, at least one first sensor output from at least one first type sensor from the plurality of sensors;

determining, by the processor, at least one property of the bill based at least in part on the at least one first sensor output;

wherein the at least one property of the bill identifies at least one of:

(i) a denomination and country of issue of the bill; or

(ii) a type of material on which the bill is printed;

receiving, by the processor, at least one second sensor output from at least one second type sensor from the plurality of sensors;

determining, by the processor, at least one bill contaminant that is present on the bill based at least in part on the at least one second sensor output;

retrieving, by the processor, an ultraviolet (UV) dose rate to be applied to the bill by ultraviolet light needed to sterilize the bill based at least in part on:

(i) the at least one bill contaminant on the bill,

(ii) the at least one property of the bill,

(iii) an illumination area of a portion of the bill, or

(iv) any combination thereof;

activating, by the processor, a UV lamp; and

transmitting, by the processor, at least one instruction to at least one of a UV shutter or the bill feed motor to result in the UV dose rate to be applied to the bill to sterilize the bill that moves in the housing, the at least one instruction controlling at least one of:

(i) the UV shutter to vary a power from the UV lamp, or

(ii) the bill feed motor to control the speed with which the bill moves in the housing.

15. The method according to claim 14 , wherein the UV lamp emits the ultraviolet light at a UVC frequency.

16. The method according to claim 14 , wherein the at least one bill contaminant that is present on the bill modifies the UV dose rate of the bill relative to a nominal UV dose rate based only on the at least one property of the bill.

17. The method according to claim 14 , wherein the determining the at least one property of the bill from the at least one first sensor output of the at least one first type sensor comprises detecting features on the bill formed from the group consisting of magnetic ink, proportions of different inks, watermarks, Intaglio printing, a security thread, a see-through register, a special foil, special foil elements, an iridescent stripe, and shifting colors.

18. The method according to claim 14 , wherein the at least one bill contaminant that is present on the bill is selected from the group consisting of humidity, grease, skin oils, hand cream, glitter, and powder.

19. The method according to claim 14 , further comprising verifying, by the processor, that the bill is sterilized from an output of a barcode reader when a barcode printed on the bill using a UV sensitive ink is visible.

20. The method according to claim 14 , further comprising verifying, by the processor, that the bill is contaminated from an output of a barcode reader when a barcode printed on the bill using a UV sensitive ink is invisible.