1. A borehole telemetry system comprising:
a coiled tubing string for use in the borehole;
a receiver coupled to the coiled tubing string; and
a transmitter coupled to the coiled tubing string;
wherein the transmitter generates signals guided for at least a portion of their path by the entire internal cross-section of the coiled tubing string to the receiver.
2. The borehole telemetry system of claim 1 wherein the receiver is located within the coiled tubing string.
3. The borehole telemetry system of claim 1 wherein the transmitter is located within the coiled tubing string.
4. The borehole telemetry system of claim 1 further comprising an instrument coupled to the transmitter.
5. The borehole telemetry system of claim 1 further comprising a storage device coupled to the receiver.
6. The borehole telemetry system of claim 1 wherein the signals comprise a modulated microwave signal.
7. The borehole telemetry system of claim 1 wherein the signals comprise a TE01 mode signal.
8. The borehole telemetry system of claim 1 wherein the signals comprise a TE11 mode signal.
9. The borehole telemetry system of claim 1 wherein the coiled tubing string contains nitrogen gas.
10. The borehole telemetry system of claim 1 wherein the coiled tubing string comprises a continuous helical metal conductor.
11. The borehole telemetry system of claim 1 wherein the coiled tubing string comprises a composite material housing.
12. A borehole telemetry system comprising:
a coiled tubing string substantially rotatably fixed in the borehole;
a receiver coupled to the coiled tubing string; and
a transmitter coupled to the coiled tubing string;
wherein the transmitter generates signals guided for at least a portion of their path by the coiled tubing string to the receiver.
13. The borehole telemetry system of claim 12 further comprising an antenna coupled to the receiver.
14. The borehole telemetry system of claim 12 further comprising an antenna coupled to the transmitter.
15. The borehole telemetry system of claim 12 further comprising an instrument coupled to the transmitter.
16. The borehole telemetry system of claim 12 further comprising a storage device coupled to the receiver.
17. The borehole telemetry system of claim 12 wherein the signals comprise a modulated microwave signal.
18. The borehole telemetry system of claim 12 wherein the signals comprise a TE01 mode signal.
19. The borehole telemetry system of claim 12 wherein the signals comprise a TE11 mode signal.
20. The borehole telemetry system of claim 12 wherein the coiled tubing string contains nitrogen gas.
21. The borehole telemetry system of claim 12 wherein the coiled tubing string comprises a continuous helical metal conductor.
22. The borehole telemetry system of claim 12 wherein the coiled tubing string comprises a composite material housing.
23. A method for communicating in a borehole, comprising the steps of:
generating signals at a transmitter coupled to a coiled tubing string in the borehole;
transmitting the signals in the entire internal cross-section of the coiled tubing string along at least a portion of their path; and
receiving the signals at a receiver coupled to the coiled tubing string.
24. The method of claim 23 wherein the signals correspond to the proximity of a casing collar to a sensor.
25. The method of claim 23 further comprising the step of receiving signals from an instrument at the transmitter.
26. The method of claim 23 further comprising the step of amplifying the received signals.
27. The method of claim 23 further comprising the step of demodulating the received signals.
28. The method of claim 23 further comprising the step of converting the frequency of the received signals.
29. The method of claim 23 wherein the signals comprise a modulated carrier of approximately 5-30 GHz.
30. The method of claim 23 further comprising the step of injecting gas into the coiled tubing string.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A lens system comprising:
a positive component, positioned in an optical path of incident light, comprising a first negative lens, a double-convex lens and a holographic optical element, respectively;
a second negative lens positioned in the optical path; and
an auxiliary double-convex lens positioned in an optical path between the positive component and the second negative lens, wherein the auxiliary double-convex lens has a magnifying power similar to the lens system.
2. The lens system of claim 1, wherein the holographic optical element is disposed on at least one surface of the first negative lens and the double-convex lens comprising the positive component.
3. The lens system of claim 1, wherein the first negative lens is made of polycarbonate.
4. The lens system of claim 1, wherein the first negative lens has a magnifying power ranging from 0.1 to 0.2.
5. The lens system of claim 1, wherein the second negative lens is made of polystyrene.
6. The lens system of claim 1, wherein the second negative lens has a magnifying power ranging from 0.5 to 0.7.
7. The lens system of claim 1, wherein at least one of the first negative lens, the double-convex lens and the second negative lens has at least one aspheric surface.
8. A lens system comprising:
a positive component, positioned in an optical path of incident light, comprising a positive lens, a double-convex lens and a holographic optical element, respectively;
a negative lens positioned in the optical path; and
an auxiliary double-convex lens positioned in an optical path between the positive component and the negative lens, wherein the auxiliary double-convex lens has a magnifying power similar to the lens system.
9. The lens system of claim 8, wherein the holographic optical element is disposed on at least one surface of the positive lens and the double-convex lens comprising the positive component.
10. The lens system of claim 8, wherein the positive lens in the form of a meniscus is made of acryl material.
11. The lens system of claim 8, wherein the positive lens is positioned at a distance of 0.15 to 0.25 times a focal length of the lens system from an object imaged by said lens system.
12. The lens system of claim 8, wherein the negative lens is made of polystyrene.
13. The lens system of claim 8, wherein the negative lens has a magnifying power ranging from 0.2 to 0.3.
14. The lens system of claim 8, wherein the auxiliary element is made of acryl material.
15. The lens system of claim 8, wherein the holographic optical element has a magnifying power ranging from 0.01 to 0.1.
16. The lens system of claim 8, wherein the holographic optical element has a phase profile VH defined by the following equation:
VH=A1y2+A2y4+A3y6
where A1 is a coefficient that is proportional to a magnifying power of the holographic optical element, A2 is a coefficient that is proportional to spherical aberration caused by the positive component, A3 is a coefficient that is proportional to spherical aberration caused by the negative lens, and y is the distance from an optical axis of the lens system measured at right angle to the optical axis.
17. The lens system of claim 8, wherein the double-convex lens is made of acryl material.
18. The lens system of claim 8, wherein the double-convex lens has a magnifying power ranging from 0.35 to 0.4.
19. An objective lens system for imaging a light from an object, the objective lens system comprising:
a system comprising:
a positive component, positioned in an optical path of the light from the object, comprising a first negative lens, a double-convex lens and a holographic optical element, respectively; and
a second negative lens positioned in the optical path after the positive component; and
an auxiliary double-convex lens positioned in an optical path between the positive component and the second negative lens, wherein the auxiliary double-convex lens has a magnifying power similar to the lens system.
20. An objective lens system for imaging a light from an object, the objective lens system comprising:
a lens system comprising:
a positive component, positioned in an optical path of the light, comprising a positive lens, a double-convex lens and a holographic optical element, respectively; and
a negative lens positioned in the optical path after the positive component; and
an auxiliary double-convex lens positioned in an optical path between the positive component and the negative lens, wherein the auxiliary double-convex lens has a magnifying power similar to the lens system.
21. An optical projection system for projecting a light emitted from an optical light source on a screen, the optical projection system comprising:
a lens system comprising:
a positive component, positioned in an optical path of the light, comprising a first negative lens, a double-convex lens and a holographic optical element; and
a second negative lens positioned in the optical path before the positive component; and
an auxiliary double-convex lens positioned in an optical path between the positive component and the second negative lens, wherein the auxiliary double-convex lens has a magnifying power similar to the lens system; and
a coupler configured to connect the optical light source to the lens system.
22. An optical projection system for projecting a light emitted from an optical light source on a screen, the optical projection system comprising:
a lens system comprising:
a positive component, positioned in an optical path of the light, comprising a positive lens, a double-convex lens and a holographic optical element;
a negative lens positioned in the optical path before the positive component; and
an auxiliary double-convex lens positioned in an optical path between the positive component and the negative lens, wherein the auxiliary double-convex lens has a magnifying power similar to the lens system; and
a coupler configured to connect the optical light source to the lens system.