摘要:
Systems and methods for inspecting an object with a scanned beam of penetrating radiation are disclosed. Scattered radiation from the beam is detected, in either the backward or forward direction. Characteristic values of the backscattered radiation are compared to expected reference values to characterize the object. Additionally, penetrating radiation transmitted through the inspected object may be combined with scatter information. In certain embodiments, the inspected field of view is less than 0.1 steradians, and the detector is separate from the source of penetrating radiation and is disposed, with respect to the object, such as to subtend greater than 0.5 steradians in the field of view of the object.
摘要:
Systems and methods for inspecting an object with a scanned beam of penetrating radiation are disclosed. Scattered radiation from the beam is detected, in either the backward or forward direction. Characteristic values of the backscattered radiation are compared to expected reference values to characterize the object. Additionally, penetrating radiation transmitted through the inspected object may be combined with scatter information. In certain embodiments, the inspected field of view is less than 0.1 steradians, and the detector is separate from the source of penetrating radiation and is disposed, with respect to the object, such as to subtend greater than 0.5 steradians in the field of view of the object.
摘要:
Apparatus and methods that permit an operator of a backscatter x-ray system to shine a search light on a closed container or vehicle, and then image the contents of that container in a region roughly corresponding to the area of the container covered by the search light. A display near the operator presents the backscatter image of the container contents.
摘要:
Methods and compositions to a clathrate that includes chlorine dioxide (ClO2) are provided. Clathrates trap gaseous chlorine dioxide to provide a dry solid material that is stable and easy to use and handle. Stable formulations of gaseous chlorine dioxide are useful as disinfectants.
摘要:
Chlorine dioxide is produced by subjecting a mixture of chlorine gas and oxygen to ultraviolet radiation. The source for chlorine and oxygen may be an alkali metal or alkaline metal hypochlorite.
摘要:
An inspection system based on penetrating radiation provides an option to significantly narrow the field of view of a scan. First and second primary limiting apertures are provided for interposition between a source of penetrating radiation and an inspected object. This allows for significantly increasing the flux of penetrating radiation on this narrowed region of interest, thereby advantageously improving detectability. Alternatively or in addition, an operator can use the higher flux to increase the distance from which an object can be imaged. Embodiments include both scatter and transmission systems that employ a pencil beam.
摘要:
A probe detects sonic energy in liquids and in materials containing liquids such as the flesh of living beings, the probe being particularly adapted for medical ultrasonics. The probe is constructed of materials having acoustic impedances substantially equal to that of water to maximize the transfer of sonic energy in a living being to an electric signal within the probe for accurate detection of high frequency pulses having a duration less than a microsecond. A piezoelectric polymer serves as the transducer and is mounted at the end of the probe housing between a thin metallic window which serves as one electrode, and a metallized rubber rod which serves as the second electrode and sonically insulates the transducer from the housing. An acoustically absorbent ring affixed to the perimeter of the face of the probe, and a flaring of the back end of the probe, reduce the diffraction and reflection of acoustic waves for improved accuracy in the measurement of submicrosecond pulses.
摘要:
An ultrasonic transducer and its method of fabrication wherein bonding between an impedance matching layer on one side of a piezoelectric layer and a support layer on the other side of the piezoelectric material is made by providing onto each material a smooth, thin gold film on the smooth surfaces of the layers which are to be in contact with one another in the assembled transducer. The layers are bonded to each other by the gold films under moderate temperature and pressure to form the transducer. Sawing of the impedance matching and piezoelectric layers into a plurality of parallel transducers attached to the support layer forms an array.
摘要:
An ultrasonic transducer and its method of fabrication wherein bonding between an impedance matching layer on one side of a piezoelectric layer and a support layer on the other side of the piezoelectric material is made by providing onto each material a smooth, thin gold film on the smooth surfaces of the layers which are to be in contact with one another in the assembled transducer. The layers are bonded to each other by the gold films under moderate temperature and pressure to form the transducer. Sawing of the impedance matching and piezoelectric layers into a plurality of parallel transducers attached to the support layer forms an array.
摘要:
Methods and compositions to a clathrate that includes chlorine dioxide (ClO2) are provided. Clathrates trap gaseous chlorine dioxide to provide a dry solid material that is stable and easy to use and handle. Stable formulations of gaseous chlorine dioxide are useful as disinfectants.