CA1073087A - Multioscillator ring laser gyro output information processing system - Google Patents
Multioscillator ring laser gyro output information processing systemInfo
- Publication number
- CA1073087A CA1073087A CA302,947A CA302947A CA1073087A CA 1073087 A CA1073087 A CA 1073087A CA 302947 A CA302947 A CA 302947A CA 1073087 A CA1073087 A CA 1073087A
- Authority
- CA
- Canada
- Prior art keywords
- ring laser
- gyro
- modes
- detector
- rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Gyroscopes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Disclosed herein is a ring laser gyroscope which operates with four circularly polarized beams at four mutually distinct frequencies, with two oppositely circularly polarized beams propagating in one direction and the two other oppositely circularly polarized beams propagating in the opposite direction, A proportion of the light energy in each beam is converted into electrical energy and the frequencies present in the electrical out-put signal thus generated are used to determine the rate and the direction of rotation of the ring laser, This is implemented by an arrangement in which light energy at all four frequencies is applied simultaneously to a single photodiode having a non-linear characteristic, thereby to produce a combined electrical signal which contains sum and difference frequencies of all four frequencies, used in the determination of the rate and the direction of rota-tion of the ring laser.
Disclosed herein is a ring laser gyroscope which operates with four circularly polarized beams at four mutually distinct frequencies, with two oppositely circularly polarized beams propagating in one direction and the two other oppositely circularly polarized beams propagating in the opposite direction, A proportion of the light energy in each beam is converted into electrical energy and the frequencies present in the electrical out-put signal thus generated are used to determine the rate and the direction of rotation of the ring laser, This is implemented by an arrangement in which light energy at all four frequencies is applied simultaneously to a single photodiode having a non-linear characteristic, thereby to produce a combined electrical signal which contains sum and difference frequencies of all four frequencies, used in the determination of the rate and the direction of rota-tion of the ring laser.
Claims (10)
1. A ring laser gyro comprising:
a multi-oscillator ring laser including means for generating four modes of laser oscillation at four respectively different frequencies, and with two of the modes propagating in each direction;
an optical detector for receiving all of said four modes;
means coupled to said detector for determining the rate of rotation of said ring laser;
means coupled to said detector for determining the direction of rotation of said ring laser; and servo means coupled to said detector for adjusting the length of the cavity of said ring laser to substantially equalize the intensity of said four modes.
a multi-oscillator ring laser including means for generating four modes of laser oscillation at four respectively different frequencies, and with two of the modes propagating in each direction;
an optical detector for receiving all of said four modes;
means coupled to said detector for determining the rate of rotation of said ring laser;
means coupled to said detector for determining the direction of rotation of said ring laser; and servo means coupled to said detector for adjusting the length of the cavity of said ring laser to substantially equalize the intensity of said four modes.
2. A ring laser gyro as defined in claim 1 wherein said detector is a single photo diode.
3. A ring laser gyro as defined in claim 1 wherein said direction determining means includes means for varying.
the plasma current of said ring laser.
the plasma current of said ring laser.
4. A ring laser gyro as defined in claim 3, further comprising means for comparing the phase of a beat signal derived from said four modes with the phase of said plasma varying means to determine the direction of rotation of said laser gyro.
5. A ring laser gyro as defined in claim 1 further comprising means for fixing said cavity length to a length cor-responding to 100% modulation of one beat signal of said four oscillation modes, by another heat signal of said four oscilla-tion modes.
6. A ring laser gyro comprising:
a multi-oscillator ring laser including means for generating four modes of laser oscillation at four respectively different frequencies, and with two of the modes propagating in each direction;
means including an optical detector for receiving all of said four modes and mixing them to produce sum and difference frequencies;
means including a low pass filter for providing first and second gyro signals which have substantially linear frequency versus rate of rotation characteristics, but which are of opposite slope;
means coupled to receive said two gyro signals for determining the rate of rotation of said ring laser;
means coupled to said detector for determining the direction of rotation of said ring laser; and servo means coupled to said detector for adjusting the length of the cavity of said ring laser to substantially equalize the intensity of said four modes.
a multi-oscillator ring laser including means for generating four modes of laser oscillation at four respectively different frequencies, and with two of the modes propagating in each direction;
means including an optical detector for receiving all of said four modes and mixing them to produce sum and difference frequencies;
means including a low pass filter for providing first and second gyro signals which have substantially linear frequency versus rate of rotation characteristics, but which are of opposite slope;
means coupled to receive said two gyro signals for determining the rate of rotation of said ring laser;
means coupled to said detector for determining the direction of rotation of said ring laser; and servo means coupled to said detector for adjusting the length of the cavity of said ring laser to substantially equalize the intensity of said four modes.
7. A ring laser gyro as defined in claim 6 wherein said detector is a single photo diode.
8. A ring laser gyro as defined in claim 6 wherein said direction determining means includes means for varying the plasma current of said ring laser.
9. A ring laser gyro as defined in claim 8, further comprising means for comparing the phase of a beat signal derived from said two gyro signals with the phase of said plasma varying means to determine the direction of rotation of said laser gyro.
10. A ring laser gyro as defined in claim 6 further comprising means for fixing said cavity length to a length corresponding to 100% modulation of one of said gyro signals by the other of said gyro signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA302,947A CA1073087A (en) | 1978-05-09 | 1978-05-09 | Multioscillator ring laser gyro output information processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA302,947A CA1073087A (en) | 1978-05-09 | 1978-05-09 | Multioscillator ring laser gyro output information processing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073087A true CA1073087A (en) | 1980-03-04 |
Family
ID=4111431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA302,947A Expired CA1073087A (en) | 1978-05-09 | 1978-05-09 | Multioscillator ring laser gyro output information processing system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1073087A (en) |
-
1978
- 1978-05-09 CA CA302,947A patent/CA1073087A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |