Ultrasonic MEMS Sensor SPM0404UD5 - Revision history

Alvin: /* Introduction */

2016-05-05T09:38:26Z

‎Introduction

2016-03-30T06:12:24Z

2016-03-30T06:11:34Z

‎Download

2016-03-30T06:06:01Z

2016-03-30T06:03:57Z

2016-03-30T05:58:35Z

‎Introduction

2016-03-30T05:57:39Z

‎Typical sensor performance

2016-03-30T05:56:54Z

‎Typical sensor performance

2016-03-30T05:54:41Z

‎Typical sensor performance

2016-03-30T05:54:01Z

‎Typical sensor performance

← Older revision		Revision as of 09:38, 5 May 2016
Line 1:		Line 1:
	== Introduction ==		== Introduction ==
		+
		+	Ultrasonic MEMS Sensor is Knowles Acoustics’ SPM0404UD5 : Mini SiSonic Ultrasonic
		+	Acoustic Sensor. This sensor was chosen for its wide and relatively flat pass
		+	band response over 10 kHz to 65 kHz.

	[[File:1-163.jpg\|600px]]		[[File:1-163.jpg\|600px]]

@@ Line 3: / Line 3: @@
 [[File:1-163.jpg|600px]]
 [[File:1-164.jpg|600px]]
 Ultrasound is defined as cyclic sound pressure above the frequency limit of human hearing, approximately 20 kHz. This is the most obvious trait of ultrasound, but not necessarily the most important. Depending on application requirements, the user may also be concerned with:
@@ Line 61: / Line 66: @@
 == Typical ultrasonic sensor applications ==

← Older revision		Revision as of 06:11, 30 March 2016
Line 80:		Line 80:

	[https://s3.amazonaws.com/linksprite/SPM0404UD5/SPM0404UD5.pdf Datasheet]		[https://s3.amazonaws.com/linksprite/SPM0404UD5/SPM0404UD5.pdf Datasheet]
		+
		+	[https://s3.amazonaws.com/linksprite/SPM0404UD5/Linker+Ultrasonic+Acoustic+Sensor+schematic.pdf Schematic]

@@ Line 40: / Line 40: @@
 The frequency response for the SPM0404UD5 covers a wide frequency band — from subsonic to ultrasonic (see Figure 2). Specialized equipment is required for measurements at both extremes of the frequency range. The SPM0404UD5 may be used as a sensor, a conventional microphone, or both.
-[[File:1-165.jpg|Frequency response for the SPM0404UD5]]
+[[File:1-165.jpg]]
-Spectral noise for the SPM0404UD5 is shown in Figure 3. Noise is measured in a sealed heavy steel enclosure that rests on a cushion to limit vibration transmission (see Figure 4).
+[[File:1-166.jpg]]
@@ Line 61: / Line 58: @@
 If using the SPM0404UD5 for low frequencies in addition to high frequencies, uniform phase performance may be important for array performance or consistency in feed-forward systems. The measurement in Figure 5 compares the SPM0404UD5 phase noise with the phase noise of a laboratory reference microphone in a sealed cavity.
-[[File:1-168.jpg|SPM0404UD5 phase noise versus laboratory reference microphone]]
+[[File:1-168.jpg]]

@@ Line 40: / Line 40: @@
 The frequency response for the SPM0404UD5 covers a wide frequency band — from subsonic to ultrasonic (see Figure 2). Specialized equipment is required for measurements at both extremes of the frequency range. The SPM0404UD5 may be used as a sensor, a conventional microphone, or both.
-[[File:1-165.jpg]]
+[[File:1-165.jpg|Frequency response for the SPM0404UD5]]
 ''Frequency response for the SPM0404UD5''
@@ Line 47: / Line 47: @@
 Spectral noise for the SPM0404UD5 is shown in Figure 3. Noise is measured in a sealed heavy steel enclosure that rests on a cushion to limit vibration transmission (see Figure 4).
-[[File:1-166.jpg]]
+[[File:1-166.jpg|Spectral noise for the SPM0404UD5]]
 ''Spectral noise for the SPM0404UD5''
-[[File:1-167.jpg]]
+[[File:1-167.jpg|Hinged noise chamber for measuring spectral noise]]
 ''Hinged noise chamber for measuring spectral noise''
@@ Line 61: / Line 61: @@
 If using the SPM0404UD5 for low frequencies in addition to high frequencies, uniform phase performance may be important for array performance or consistency in feed-forward systems. The measurement in Figure 5 compares the SPM0404UD5 phase noise with the phase noise of a laboratory reference microphone in a sealed cavity.
-[[File:1-168.jpg]]
+[[File:1-168.jpg|SPM0404UD5 phase noise versus laboratory reference microphone]]
 ''SPM0404UD5 phase noise versus laboratory reference microphone''