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Using several radio telescopes together as an interferometer allows for a larger effective aperture, which enhances the resolution and sensitivity of astronomical observations. This technique combines the signals from multiple telescopes to create a virtual telescope with a resolution equivalent to a single dish with a diameter equal to the farthest separation between the telescopes. This results in sharper images and the ability to detect fainter signals from celestial objects.
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What is the relation of Figure of merit with current sensitivity?
The figure of merit is used to evaluate the performance of a sensor by considering factors like sensitivity, resolution, and noise. Current sensitivity specifically refers to the ability of a sensor to respond to changes in current. A higher figure of merit indicates better overall sensor performance, which can be influenced by the current sensitivity of the sensor.
How can the sensitivity of a thermometer be increased?
The sensitivity of a thermometer can be increased by using a finer scale or increasing the resolution of the measurement gradations. Using a material with a higher thermal expansion coefficient may also improve sensitivity. Additionally, reducing the heat capacitance of the thermometer can make it more responsive to temperature changes.
What is the least count of a voltmeter?
The least count of a voltmeter is the smallest measurable change in voltage that the device can detect. It is determined by the resolution of the display and the sensitivity of the measuring components. It is important for accurate voltage measurement.
What are the Characteristics of a sensor?
Sensors are devices that measure physical quantities and convert them into a signal that can be interpreted. They typically possess sensitivity, accuracy, resolution, and response time characteristics. Additionally, sensors may exhibit linearity, hysteresis, and repeatability in their measurements.
In what wavelength range was interferomentry first routinely used?
Interferometry was first routinely used in the visible and near-infrared wavelength range, such as around 0.5 to 1.0 micrometers. This allowed for precise measurements and imaging of astronomical objects with high angular resolution.
What is the significance of the distance between the two dishes in a radio interferometer with two dishes?
The distance between the two dishes in a radio interferometer is significant because it determines the resolution and sensitivity of the instrument. A larger distance between the dishes allows for higher resolution and the ability to detect fainter signals from celestial objects. This is important in radio astronomy for studying the fine details of distant objects in space.
How does the atmosphere limit astronomical observations?
The atmosphere blocks certain wavelengths of light from reaching telescopes on the ground, which affects the quality of observations. It also causes distortion and blurring of images due to turbulence and temperature gradients. This limits the resolution and accuracy of astronomical observations made from Earth.
What is the interferometer used for?
It allows two or more small telescopes to achieve the angular resolution of a much larger telescope. This instrument is credited to Albert A. Michaelson.
When multiple radio telescopes are used for interferometry resolving power is most improved by increasing?
Increasing the distance between the two most widely separated radio telescopes has an enormous effect on resolution.
Connecting multiple telescopes together to combine the images is called?
telescopes
What is the radio interferometer?
A radio interferometer is a scientific instrument used to observe and study radio waves emitted by celestial objects such as stars, galaxies, and quasars. It consists of multiple radio antennas or dishes that are spread out over a large area and work together to create a combined signal. By combining the signals from different antennas, a radio interferometer can create high-resolution images and precise measurements of radio sources in the universe.
Damage to the fovea would probably have the least effect on visual sensitivity to what stimuli?
Damage to the fovea would have the least effect on visual sensitivity to dim light, peripheral movement, and low-resolution stimuli, as the fovea is responsible for central vision and high-resolution details.
What is the relation of Figure of merit with current sensitivity?
The figure of merit is used to evaluate the performance of a sensor by considering factors like sensitivity, resolution, and noise. Current sensitivity specifically refers to the ability of a sensor to respond to changes in current. A higher figure of merit indicates better overall sensor performance, which can be influenced by the current sensitivity of the sensor.
How can the sensitivity of a thermometer be increased?
The sensitivity of a thermometer can be increased by using a finer scale or increasing the resolution of the measurement gradations. Using a material with a higher thermal expansion coefficient may also improve sensitivity. Additionally, reducing the heat capacitance of the thermometer can make it more responsive to temperature changes.
What are two ways the atmosphere limits what astronomers can detect?
Atmospheric absorption: Certain wavelengths of light can be absorbed by gases in the Earth's atmosphere, making it difficult for astronomers to detect celestial objects at those specific wavelengths. Atmospheric turbulence: Turbulence in the atmosphere can cause distortions in the images obtained by telescopes, affecting the resolution and clarity of astronomical observations.
Where can you find sites with free downloads of high resolution videos and pictures about astronomy as well as documented writings and explanations of astronomical phenomena?
at the NASA website. http://www.NASA.gov
What is characteristics of LVDT?
1.Null Voltage 2.Resolution 3.Linearity 4.Sensitivity 5.Excitation voltage and excitation frequency 6.Dynamic response
