Sharp Ir Sensor Results

I got measuring tape and measured the distance for values using a flat book.

i got the following results

Cm Average Value
1 268
2 242
3 355
4 419
5 445
6 457
7 476
8 493
9 527
10 551
11 572
12 586
13 589
14 576
15 596
16 560
17 541
18 526
19 519
20 508
21 500
22 483
23 471
24 468
25 455
26 442
27 417
28 405
29 397
30 370
31 358
32 349
33 340
34 325
35 317
36 312
37 306
38 290
39 286
40 283
41 274
42 266
43 258
44 248
45 241


Conclusion: That there will need to be a 15cm gap as the sensor values peak at that point

I also noted that if i changed the angle of the book slightly that it would throw the value off around 20 -50 so the ir sensor reacts to changed in angle and works best at a flat surface