Abstract: According to one aspect, embodiments herein provide a digital unit cell comprising a photodiode, an integration capacitor coupled to the photodiode and configured to accumulate charge generated by the photodiode responsive to an input light signal incident on the photodiode over an integration period, a comparator coupled to the integration capacitor and configured to compare a voltage across the integration capacitor with a voltage reference and to generate a clock signal at a first level each time a determination is made that the voltage across the integration capacitor is greater than the voltage reference, a shift register coupled to the comparator and configured to receive the clock signal from the comparator and increase a count value each time the clock signal at the first level is received from the comparator, and an output coupled to the shift register and configured to provide the count value to an external system.

Abstract: According to one aspect, embodiments herein provide a digital unit cell comprising a photodiode, an integration capacitor coupled to the photodiode and configured to accumulate charge generated by the photodiode responsive to an input light signal incident on the photodiode over an integration period, a comparator coupled to the integration capacitor and configured to compare a voltage across the integration capacitor with a voltage reference and to generate a clock signal at a first level each time a determination is made that the voltage across the integration capacitor is greater than the voltage reference, a shift register coupled to the comparator and configured to receive the clock signal from the comparator and increase a count value each time the clock signal at the first level is received from the comparator, and an output coupled to the shift register and configured to provide the count value to an external system.

Abstract: According to one aspect, embodiments herein provide a unit cell circuit comprising a photodetector, a first integration capacitor, a first input circuit configured to maintain charge on the integration capacitor corresponding to photo-current received from the photodetector during an integration period, a first comparator coupled to the first integration capacitor and configured to compare a first integration voltage across the first integration capacitor to a first threshold reference voltage, a register coupled to the first comparator, and a counter coupled to the register and configured to repeatedly increment a counter value over the integration period, wherein in response to determining that the first integration voltage is at a certain level in relation to the first threshold reference voltage, the first comparator is further configured to output a first output signal configured to control the register to latch the counter value of the counter.

Abstract: According to one aspect, embodiments herein provide a unit cell circuit comprising a photodetector, a first integration capacitor, a first input circuit configured to maintain charge on the integration capacitor corresponding to photo-current received from the photodetector during an integration period, a first comparator coupled to the first integration capacitor and configured to compare a first integration voltage across the first integration capacitor to a first threshold reference voltage, a register coupled to the first comparator, and a counter coupled to the register and configured to repeatedly increment a counter value over the integration period, wherein in response to determining that the first integration voltage is at a certain level in relation to the first threshold reference voltage, the first comparator is further configured to output a first output signal configured to control the register to latch the counter value of the counter.

Abstract: According to one embodiment, an apparatus includes a directed energy device configured to direct energy onto a remote target under control of a controller. The receives a distance measurement to the target using a rangefinder, determines whether the target is within an expected range; and modifies a power output of the directed energy device when the target is not within the expected range.

Abstract: A sensor aperture cleaning system includes a fluid dispensing arm movable between a stowed position in which the fluid dispensing arm is outside a field of view of a sensor aperture and a cleaning position in which the fluid dispensing arm is disposed within the field of view of the sensor aperture. The system further comprises a piston mechanism, a housing sized to slidably receive the piston mechanism, and a biasing member disposed within the housing and configured to bias the piston mechanism. The piston mechanism is coupled to the fluid dispensing arm and is configured to move the fluid dispensing arm from the stowed position to the cleaning position in response to pressure on the piston mechanism from a pressurized fluid.

Abstract: According to one embodiment, an apparatus includes a directed energy device configured to direct energy onto a remote target under control of a controller. The receives a distance measurement to the target using a rangefinder, determines whether the target is within an expected range; and modifies a power output of the directed energy device when the target is not within the expected range.

Abstract: An apparatus for multi-spectral imaging includes a microbolometer array comprising a two-dimensional array of microbolometer detectors that are configured to respond to energy having a first range of wavelengths comprising a first plurality of spectral bands. The apparatus also includes a wideband window configured to allow energy having a second range of wavelengths to reach the microbolometer array. The second range of wavelengths comprises a second plurality of spectral bands. The apparatus additionally includes optics configured to focus the energy from a scene towards the microbolometer array. The apparatus further includes a processor configured to generate an output based on a response of the microbolometer array to energy having a third range of wavelengths comprising a third plurality of spectral bands. There is substantial overlap between the first, second, and third range of wavelengths and the first, second, and third plurality of spectral bands.

Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using at least one bearing arm. The at least one bearing arm movably couples the object to the base at a first position relative to a third axis and a fourth axis. The at least one bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the at least one bearing arms to maintain the first axis when a tilt angle of the base is detected.

Abstract: A sensor aperture cleaning system comprising a fluid dispensing arm movable between a stowed position in which the fluid dispensing arm is outside a field of view of a sensor aperture and a cleaning position in which the fluid dispensing arm is disposed within the field of view of the sensor aperture. The system further comprises a piston mechanism, a housing sized to slidably receive the piston mechanism, and a biasing member disposed within the housing and configured to bias the piston mechanism The piston mechanism is coupled to the fluid dispensing arm and is configured to move the fluid dispensing arm from the stowed position to the cleaning position in response to pressure on the piston mechanism from a pressurized fluid.

Abstract: An apparatus for multi-spectral imaging includes a microbolometer array comprising a two-dimensional array of microbolometer detectors that are configured to respond to energy having a first range of wavelengths comprising a first plurality of spectral bands. The apparatus also includes a wideband window configured to allow energy having a second range of wavelengths to reach the microbolometer array. The second range of wavelengths comprises a second plurality of spectral bands. The apparatus additionally includes optics configured to focus the energy from a scene towards the microbolometer array. The apparatus further includes a processor configured to generate an output based on a response of the microbolometer array to energy having a third range of wavelengths comprising a third plurality of spectral bands. There is substantial overlap between the first, second, and third range of wavelengths and the first, second, and third plurality of spectral bands.

Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using at least one bearing arm. The at least one bearing arm movably couples the object to the base at a first position relative to a third axis and a fourth axis. The at least one bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the at least one bearing arms to maintain the first axis when a tilt angle of the base is detected.

Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using at least one bearing arm. The at least one bearing arm movably couples the object to the base at a first position relative to a third axis and a fourth axis. The at least one bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the at least one bearing arms to maintain the first axis when a tilt angle of the base is detected.

Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using at least one bearing arm. The at least one bearing arm movably couples the object to the base at a first position relative to a third axis and a fourth axis. The at least one bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the at least one bearing arms to maintain the first axis when a tilt angle of the base is detected.

Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using first and second bearing arms. The first and second bearing arms movably couple the object to the base at a first position relative to a third axis and a fourth axis. The first bearing arm couples to the object at a first pivot point. The second bearing arm coupled to the object at a second pivot point. Each bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the first and second bearing arms to maintain the first axis when a tilt angle of the base is detected.

Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using first and second bearing arms. The first and second bearing arms movably couple the object to the base at a first position relative to a third axis and a fourth axis. The first bearing arm couples to the object at a first pivot point. The second bearing arm coupled to the object at a second pivot point. Each bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the first and second bearing arms to maintain the first axis when a tilt angle of the base is detected.

Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using first and second bearing arms. The first and second bearing arms movably couple the object to the base at a first position relative to a third axis and a fourth axis. The first bearing arm couples to the object at a first pivot point. The second bearing arm coupled to the object at a second pivot point. Each bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the first and second bearing arms to maintain the first axis when a tilt angle of the base is detected.

Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using first and second bearing arms. The first and second bearing arms movably couple the object to the base at a first position relative to a third axis and a fourth axis. The first bearing arm couples to the object at a first pivot point. The second bearing arm coupled to the object at a second pivot point. Each bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the first and second bearing arms to maintain the first axis when a tilt angle of the base is detected.