摘要:
A gravimeter is disclosed that comprises a base, a reference device coupled to the base and configured to move along a first axis, a falling device configured to free fall from a first position to a second position on a second axis that is parallel to the first axis, a measurement module coupled to the reference device and configured to provide a first signal of the displacement of the reference device relative to the base and provide a second signal of the displacement of the falling device relative to the reference device. A processing unit accepts the first and second signals and computes a displacement of the falling device in inertial space by processing the first and second signals and subtracting the processed first signal from the processed second signal.
摘要:
A gravity gradiometer (1) comprising first (2) and second proof masses (4) and means (13) for providing simultaneous free flight of the proof masses under the influence of the gravitational force in which the gradient is to be measured and capacitance means (6, 7) for monitoring the movement of the centres of mass (3, 5) with respect to each other during free flight by monitoring capacitance between portions of the two proof masses.
摘要:
A test mass used for light beam interferometric gravity characteristic measurement has a center of mass located equidistant and colinear with optical center points of two oppositely reflecting retroreflectors. Rotation of the test mass about its center of mass during freefall changes the path length of the oppositely reflected light beams by equal amounts, thereby achieving common mode cancellation of the effects of test mass rotation when the two reflected light beams are interferometrically combined.
摘要:
A gravity gradient is measured interferometrically from two light beams which each reflect from both of two freefalling test masses. The light beams project in beam arms which remain equal in length as the two test masses freefall except for different effects of gravity on each test mass and any initial relative velocity difference imparted to the test masses. The optical path length of the beam arms also change equally and oppositely during freefall, to amplify the interferometric effect by four times. A high level of common mode rejection eliminates many spurious influences.
摘要:
A borehole tool including an interferometer, a light source, a chamber containing a sliding weight having a first optical prism, a second optical prism located within the chamber, a tilt measuring device, and a timing device operatively associated with the interferometer. The light source, the interferometer, and the first and second optical prisms are configured to cause light emitted by the light source to form a first beam and a second beam that interfere with each other. The interferometer measures distances traveled by the sliding weight in the upward and downward direction by counting the fringes caused by the interference between the first beam and the second beam. The tilt measuring device measures the angle of the chamber relative to vertical. The influence of friction on the sliding weight's motion is eliminated by comparing the distances traveled by it in its upward and downward path over an equal time interval.
摘要:
A cold atom gravity gradiometer system includes a laser source that generates a laser beam that propagates along a propagation direction. The system further includes a reflector that reflects a portion of the laser beam and transmits another portion of the laser beam (the transmitted portion). A second reflector spatially separated from the first reflector along the propagation direction reflects the transmitted portion of the laser beam.
摘要:
A cold atom gravity gradiometer system includes a laser source that generates a laser beam that propagates along a propagation direction. The system further includes a reflector that reflects a portion of the laser beam and transmits another portion of the laser beam (the transmitted portion). A second reflector spatially separated from the first reflector along the propagation direction reflects the transmitted portion of the laser beam.
摘要:
Группа изобретений относится к области физики, в частности, к гравиметрии и может быть использовано при проведении геофизических исследований, результаты которых востребованы в таких областях техники как астрономия, геодезия и геология. Задачей, на решение которой направлена группа изобретений, является разработка способа измерения и устройства, повышающих информативность гравиметрических измерений. Поставленная задача решается за счет того, что в способе измерения ускорения свободного падения (g z ) посредством измерения деформации первичного механического преобразователя гравиметрического датчика, пропорциональной силе тяжести пробной массы (mg z ), значение ускорения gz дополняют мерой сравнения - известным значением центростремительного ускорения (а ц ), с таким расчетом, чтобы они воздействовали на пробную массу датчика совместно в виде результирующего вектора (g z +а ц ). Способ может быть реализован посредством устройства измерения ускорения свободного падения g z , оснащенного гравиметрическим датчиком, содержащим пробную массу m, первичным преобразователем, регистратором его деформации, усилителем, цифровым преобразователем, компьютером и работающим в автоматическом режиме, я при этом гравиметрический датчик, содержащий электромеханический преобразователь, расположен на диске с осью. Кроме того, устройство может быть оснащено приводом принудительного вращения, который обеспечивает вращение диска в прямом и обратном направлениях с заданной угловой скоростью вращения, а диск может быть размещен в координатном устройстве, обеспечивающем возможность выполнять измерения в выбранном пространственном положении плоскости вращения.
摘要:
The disclosure relates to a gravity gradiometer comprising a pair of magneto-optical traps for measuring a gravity gradient. Example embodiments include a cold atom gravity gradiometer system (100) comprising: first and second magneto-optical traps (101, 102), each having a plurality of mirrored surfaces (103, 104) arranged to reflect an incident laser beam (105, 106) to trap respective first and second cold atom clouds (107, 108) separated from each other by a separation distance; an optical subsystem arranged to transmit a first laser beam (105) in a first direction along a first longitudinal axis towards the first magneto-optical trap (101) and a second laser beam (106) in an opposite second direction along a second longitudinal axis towards the second magneto-optical trap (102), the second longitudinal axis being parallel to the first longitudinal axis.
摘要:
Incident differently-polarized light beams are separately directed and combined by one or two corner cube structures, each having one or two walls formed as a beam splitter. One incident light beam is passed, while the other incident light beam is reflected.