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2. Accelerometer - Wikipedia

   en.wikipedia.org/wiki/Accelerometer

   An accelerometer measures proper acceleration, which is the acceleration it experiences relative to freefall and is the acceleration felt by people and objects. [2] Put another way, at any point in spacetime the equivalence principle guarantees the existence of a local inertial frame, and an accelerometer measures the acceleration relative to that frame. [4]

3. Laser accelerometer - Wikipedia

   en.wikipedia.org/wiki/Laser_accelerometer

   An accelerometer was announced that used infrared light to measure the change in distance between two micromirrors in a Fabry–Perot cavity. The proof mass is a single silicon crystal with a mass of 10–20 mg, suspended from the first mirror using flexible 1.5 μm-thick silicon nitride (Si 3 N 4) beams. The suspension allows the proof mass to ...

4. Proper acceleration - Wikipedia

   en.wikipedia.org/wiki/Proper_acceleration

   In relativity theory, proper acceleration [1] is the physical acceleration (i.e., measurable acceleration as by an accelerometer) experienced by an object. It is thus acceleration relative to a free-fall, or inertial, observer who is momentarily at rest relative to the object being measured.

5. Piezoelectric accelerometer - Wikipedia

   en.wikipedia.org/wiki/Piezoelectric_accelerometer

   A piezoelectric accelerometer is an accelerometer that employs the piezoelectric effect of certain materials to measure dynamic changes in mechanical variables (e.g., acceleration, vibration, and mechanical shock).

6. Inertial measurement unit - Wikipedia

   en.wikipedia.org/wiki/Inertial_measurement_unit

   Inertial navigation unit of French IRBM S3 IMUs work, in part, by detecting changes in pitch, roll, and yaw. An inertial measurement unit works by detecting linear acceleration using one or more accelerometers and rotational rate using one or more gyroscopes. [3]

7. Is It Just Stress...Or Perimenopause? Doctors Explain How To ...

   www.aol.com/just-stress-perimenopause-doctors...

   Here's how to pinpoint when you're actually in this phase of life even if your symptoms (hot flashes, mood swings, stress, dryness) are nonspecific.