The Big Sonar Quiz Thread

[rnvinc]

Sonar Quiz#17 Courtesy of rnvinc

Piezo elements are designed to purposely incorporate 3 major criteria of the piezo element's characteristics....

1. What criteria determines the "shape" of a piezo element's sonar beam ...??

2. What criteria determines the "size" (beam angle) of a piezo element's sonar beam ...??

3. What criteria determines the "Resonate Frequency(s)" of a piezo element's sonar beam ...??

Rickie

Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-17-a/

---

Sonar Quiz#18 Courtesy of rnvinc

Which way does this xducer need adjusting ...??

What clue(s) in the image gives it away ...??



Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-18-a/

---

Sonar Quiz#19 Courtesy of rnvinc

In the previous quiz we learned that the "leading" and "trailing" ends of a full arch (from a properly adjusted xducer) ...are indications that the target (fish) was at a greater "Range" from the xducer than when the target (fish) was in the center of the sonar cone...

In the depiction below...explain why the arch is painted thicker at the "center" than it is painted at the "leading" and "trailing" ends...



Rickie

Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-19-a/

---

Sonar Quiz#20 Courtesy of rnvinc

Many color sonar units these days offer several 2d palettes to choose from...

The colors entailed in each Palette choice mean something more than to just make pretty sonar images...

Here is the HB Original Palette as an example...

What factor(s) dictate which color in the chosen Palette scheme get "painted" on each pixel (or group of pixels)...??



Rickie

Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-20-a/

---

Sonar Quiz#21 Courtesy of rnvinc

Can a 2d skimmer xducer be used mounted backwards ...with the flat end facing forward ...??

What would the image look like ...??

Explain ...



Rickie

Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-21-a/

---

Sonar Quiz#22 Courtesy of rnvinc

What details in the following image give indication of bottom hardness/softness ...??

Explain what is happening to the sound pulse (ping) for that echo data to be "painted" as seen in the image ...



Rickie

Discussion and answers can be found in the thread at[/SIZE] http://www.crappie.com/crappie/side-...nar-quiz-22-a/

---

Sonar Quiz#23 Courtesy of rnvinc

The image below shows a split frequency screen ...(credit to Peter at continuouswave)...

Same sonar history ... 200kHz on the left and 83kHz on the right ...

Explain why the 200kHz doesn't paint the pretty arch like the 83kHz does (in this example of the same echo targets)...



Rickie

Discussion and answers can be found in the thread at [/SIZE]http://www.crappie.com/crappie/side-...nar-quiz-23-a/

---

Sonar Quiz#24 Courtesy of rnvinc

Here's an interesting shot ...

What is causing the anomaly in the right SI water column ...??

(credit to Spearfish III for the image)



Rickie

Discussion and answers can be found in the thread athttp://www.crappie.com/crappie/side-...nar-quiz-24-a/

---