[특허]Sensor for eye-safe and body-fixed semi-active laser guidance

Raytheon Company

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특허 상세정보

MyON담기

내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Sensor for eye-safe and body-fixed semi-active laser guidance

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01C-021/02 H01J-040/14
미국특허분류(USC)	250/203.1; 250/214.0R
출원번호	UP-0891982 (2007-08-14)
등록번호	US-7842908 (2011-01-31)
발명자 / 주소	Andresson, Clarence C.
출원인 / 주소	Raytheon Company
대리인 / 주소	Schwegman, Lundberg & Woessner, P.A.
인용정보	피인용 횟수 : 3 인용 특허 : 4

초록
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A sensor for laser spot trackers. The novel sensor includes a detector array comprised of a predetermined number of subsets, each subset including a plurality of detector elements, and a readout circuit for providing a first output and a second output, the first output including subset signals that represent the total energy received in each subset and the second output including signals representing energy received by each individual detector element. In an illustrative embodiment, the array is divided into four subsets and the first output includes four subset signals that are compatible with four-quadrant guidance systems. A subset signal is generated by thresholding signals received from each individual detector element to remove noise, and then summing the thresholded signals from each detector element in the subset.

대표
청구항
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What is claimed is: 1. An eye-safe laser sensor comprising: a detector array including at least four subsets, each subset comprising a plurality of detector elements fabricated from InGaAs or HgCdTe for detection of eye-safe laser wavelengths; and a readout circuit to generate a first output and a second output, the first output comprising a subset signal for each subset that represents total energy received in each subset, the second output comprising a detector signal for each detector element representing energy received by each individual detector element wherein the first output indicates a region of the detector array in which a laser spot is sensed, and wherein the second output indicates a location of the sensed laser spot within the region. 2. The sensor of claim 1 wherein the readout circuit comprises: circuitry to read out the subset signals in parallel; and circuitry to serially read out signals the detector signals from each of the detector elements. 3. The sensor of claim 1 wherein the first output is for use in initial acquisition of the laser spot, and wherein the second output is for use in tracking the laser spot after the initial acquisition. 4. The sensor of claim 3 wherein each subset corresponds to a quadrant of the detector array, and wherein the subset signals correspond to quadrant output signals of a four-quadrant guidance system. 5. The invention sensor of claim 1 wherein the readout circuit comprises a summing circuit for each subset of detector elements to generate the subset signals, each summing circuit adapted to add thresholded signals from each detector element in a subset to generate the subset signal for the subset. 6. The sensor of claim 5 wherein the readout circuit further comprises a recording circuit coupled to each thresholding circuit, each recording circuit adapted to record an amplitude and a time of arrival of each thresholded signal for use in generating the detector signal for each detector element. 7. The sensor of claim 6 wherein the readout circuit further comprises: a preamplifier coupled to each detector element, each preamplifier adapted to output a received detector signal; a thresholding circuit coupled to each preamplifier, each thresholding circuit adapted to remove noise lower than a predetermined threshold from a detector signal to generate a thresholded signal; sample and hold circuits for each detector element to recode the amplitude of each thresholded signal; and a multiplexer adapted to serially read out the recorded amplitude and time from each of the detector elements to provide the second output. 8. The sensor of claim 1 wherein the detector elements have a size of less than 0.1 square inches. 9. A readout circuit comprising: a first circuitry to receive signals from each of a plurality of detector elements fabricated from InGaAs or HgCdTe for detection of eye-safe laser wavelengths, wherein the detector elements are grouped into at least four subsets; a second circuitry to threshold each signal to remove noise below a predetermined threshold; a third circuitry to generate a first output comprising a subset signal for each subset by adding thresholded signals from each detector element in a subset; and fourth circuitry to generate a second output comprising a detector signal for each detector element representing energy received by each individual detector element. 10. The readout circuit of claim 9 comprising circuitry to read out the subset signals in parallel and circuitry to serially read out signals the detector signals from each of the detector elements, wherein the plurality of detector elements comprise a detector array, wherein the first output indicates a region of the detector array in which a laser spot is sensed, and wherein the second output indicates a location of the sensed laser spot within the region. 11. The readout circuit of claim 10 further comprising circuitry for recording an amplitude and a time of arrival of each thresholded signal. 12. The readout circuit of claim 11 further comprising a multiplexer to serially read out the recorded amplitude and time from each of the detector elements. 13. The readout circuit of claim 9 wherein the first circuitry comprises a plurality of transimpedance amplifiers, each amplifier coupled to a detector element and adapted to output a received detector signal, wherein the second-circuitry comprises a plurality of thresholding circuits, each thresholding circuit coupled to a transimpedance amplifier, and wherein each thresholding circuit comprises: a comparator adapted to compare a detector signal with a predetermined threshold and in accordance therewith generate a control signal; and a switch adapted to receive the control signal and in accordance therewith open or close to couple the amplifier output to an output of the thresholding circuit. 14. The readout circuit of claim 9 wherein the third circuitry comprises a summing circuit for each subset of detector elements to generate the first output, each summing circuit adapted to add thresholded signals from each detector element in a subset to generate an output signal for the subset. 15. The readout circuit of claim 9 wherein the detector elements have a size of less than 0.1 square inches. 16. A method for processing a detector array comprising: dividing the detector array into at least four subsets, each subset including a plurality of detector elements for detection of eye-safe laser wavelengths; thresholding detected signals received from the detector elements to remove noise below a predetermined threshold; summing the thresholded signals in each subset to generate a subset signal for each subset; providing a first output comprising the subset signals, the first output indicating a region of the detector array in which a laser spot is sensed; and providing a second output comprising the thresholded signals from each individual detector element, the second output indicating a location of the sensed laser spot within the region. 17. The method of claim 16 further comprising: using the first output for initial acquisition of the laser spot, and using the second output for tracking the laser spot after the initial acquisition. 18. A laser spot tracker for tracking an eye-safe laser spot comprising: a detector array including a predetermined number of subsets, each subset including a plurality of detector elements fabricated from InGaAs or HgCdTe for detection of eye-safe laser wavelengths; a readout circuit coupled to generate first and second outputs, the first output comprising a subset signal from each subset that represents a total energy received by detector elements in the subset, the second output comprising a detector signal for each detector element representing energy received by each individual detector element; and a processor adapted to receive the first and second outputs from the readout circuit and to determine a position of the laser spot within the detector array, wherein the first output indicates a region of the detector array in which the laser spot is sensed for use by the processor in initial acquisition of the laser spot, and wherein the second output indicates a location of the laser spot within the region for use by the processor in tracking the laser spot after the initial acquisition. 19. The laser spot tracker of claim 18 wherein the detector elements have a size of less than 0.1 square inches.

이 특허에 인용된 특허 (4)

이 특허를 인용한 특허 피인용횟수: 3

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특허 상세정보

Sensor for eye-safe and body-fixed semi-active laser guidance

초록
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이 특허에 인용된 특허 (4)

이 특허를 인용한 특허 피인용횟수: 3

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Sensor for eye-safe and body-fixed semi-active laser guidance

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이 특허에 인용된 특허 (4)

이 특허를 인용한 특허 피인용횟수: 3

IPC 상위 출원인

과제정보

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IPC 상세정보(version : 201201)

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