Answers.Body: <p>ETH Zurich faculty/students conducted some experiments on exactly this back in 2006.  The relevant parts of their results have been reproduced below.  For more information, visit their website: <a href="http://www.tik.ee.ethz.ch/mindstorms/sa_nxt/index.php?page=tests_us" rel="nofollow noreferrer">http://www.tik.ee.ethz.ch/mindstorms/sa_nxt/index.php?page=tests_us</a>.</p>
  
  <p>The chart below shows accuracy of the sensor at detecting a 14.5 cm x 9.5 cm x 6 cm block at various distances and angles from the sensor.</p>
  
  <p><img src="https://i.sstatic.net/3q4GF.jpg" alt="enter image description here"></p>
  
  <p><strong>Distanz</strong> is Distance in CM, <strong>Winkel</strong> is Angle in degrees, and <strong>Relative Fehler</strong> is relative error.  </p>
  
  <p>According to the researchers:</p>
  
  <blockquote>
    <p>The results show that the ultrasonic sensor should always be placed in horizontal position, other positions decrease as well the field of vision as the sighting distance of the sensor. The sensor seems to be a bit 'blind' on the left eye, which can be explained by the fact that the left eye is actually the receiver of the ultrasonic wave while the right eye is the sender.</p>
  </blockquote>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-03-08T22:52:52.060Z
Answers.Text: Could you please summarise the answer (or, possibly, copy (with permit of the ETHZ people) it in its entirety) here, in case the link goes dead? Not assuming any external resources is a part of what makes a great StackExchange answer.
Answers.UserDisplayName: mirabilos
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Answers.CreationDate: 2013-11-18T02:19:44.603Z
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Answers.LastEditDate: 2014-09-14T07:56:11.290Z
Answers.UserDisplayName: oddTodd
Body: <p>Hey I'm programming a sumobot for a first-year university Civil Engineering project. We should need the sight of the ultrasonic sensor according tot the distance of an object. 
  For example, the sensor can detect an object that is located 30 cm away 55° to the right of the sensor, but an object 50 cm away from the sensor can only be detected to 45° to the right of the sensor (approximately). Does anyone know the relationship (maybe a function?) between the sight and the distance? Thanks!</p>
  
Tags: <mindstorms><nxt>
Title: What's the sight of the ultrasonic sensor according to the distance of the object?
UserDisplayName: Simon
ThreadText: # What's the sight of the ultrasonic sensor according to the distance of the object?
  
  (Asked by: username_0 on 2013-11-17)
  
  Hey I'm programming a sumobot for a first-year university Civil Engineering project. We should need the sight of the ultrasonic sensor according tot the distance of an object.
  For example, the sensor can detect an object that is located 30 cm away 55° to the right of the sensor, but an object 50 cm away from the sensor can only be detected to 45° to the right of the sensor (approximately). Does anyone know the relationship (maybe a function?) between the sight and the distance? Thanks!
  
  **Tags:** mindstorms, nxt
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2013-11-18. Score: 1
  
  ETH Zurich faculty/students conducted some experiments on exactly this back in 2006. The relevant parts of their results have been reproduced below. For more information, visit their website: <http://www.tik.ee.ethz.ch/mindstorms/sa_nxt/index.php?page=tests_us>.
  
  The chart below shows accuracy of the sensor at detecting a 14.5 cm x 9.5 cm x 6 cm block at various distances and angles from the sensor.
  
  ![enter image description here](https://i.sstatic.net/3q4GF.jpg)
  
  **Distanz** is Distance in CM, **Winkel** is Angle in degrees, and **Relative Fehler** is relative error.
  
  According to the researchers:
  
  > The results show that the ultrasonic sensor should always be placed in horizontal position, other positions decrease as well the field of vision as the sighting distance of the sensor. The sensor seems to be a bit 'blind' on the left eye, which can be explained by the fact that the left eye is actually the receiver of the ultrasonic wave while the right eye is the sender.
  
  > **Comments:**
  > **username_2**: Could you please summarise the answer (or, possibly, copy (with permit of the ETHZ people) it in its entirety) here, in case the link goes dead? Not assuming any external resources is a part of what makes a great StackExchange answer.  
  
  ---
  
  