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- since 1996 -
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Technical Discussions
N. Y. Kao
N. Y. Kao
09:36 Apr-17-2000
Vibration sensor

Hi,

I am a student undergoing a project 'Heart Rate Monitor'.

I am trying to capture wrist pulse in order to measure the heart rate.

Here are few questions:
1. How to use a vibration sensor?

2. Is it it converts mechanical force into voltage directly? Then i capture the signal using an amplifier?

3. My friend recomend me bi-morph flexure elements. But, how to use it? Any application notes?

Your help is much appreciated.
Thank you!


 
 Reply 
 
steve
steve
02:26 May-09-2001
Re: Vibration sensor
Hi,
I'm looking for info on the bi-morph vibration sensors too. So far i've discovered the main issue with these devices is that they like to be connected to high-impedance inputs. 1 to 2 Megohms. "FET input op-amps" are a good starting point.

steve

: Hi,

: I am a student undergoing a project 'Heart Rate Monitor'.

: I am trying to capture wrist pulse in order to measure the heart rate.

: Here are few questions:
: 1. How to use a vibration sensor?

: 2. Is it it converts mechanical force into voltage directly? Then i capture the signal using an amplifier?

: 3. My friend recomend me bi-morph flexure elements. But, how to use it? Any application notes?

: Your help is much appreciated.
: Thank you!




 
 Reply 
 
Dr. Patel
R & D, Consultant to Universities/Industries
Fallon Ultrasonics/McMaster University, Canada, Joined May 2001, 20

Dr. Patel

R & D, Consultant to Universities/Industries
Fallon Ultrasonics/McMaster University,
Canada,
Joined May 2001
20
04:52 May-09-2001
Re: Vibration sensor
: Hi,
: I'm looking for info on the bi-morph vibration sensors too. So far i've discovered the main issue with these devices is that they like to be connected to high-impedance inputs. 1 to 2 Megohms. "FET input op-amps" are a good starting point.
.
: steve
.
: : Hi,
.
: : I am a student undergoing a project 'Heart Rate Monitor'.
.
: : I am trying to capture wrist pulse in order to measure the heart rate.
.
: : Here are few questions:
: : 1. How to use a vibration sensor?
.
: : 2. Is it it converts mechanical force into voltage directly? Then i capture the signal using an amplifier?
.
: : 3. My friend recomend me bi-morph flexure elements. But, how to use it? Any application notes?
.
: : Your help is much appreciated.
: : Thank you!
.
Firstly in mechanical enineering they have force sensor which may work. You need a charge amplifiers with high impedance. With bimorphs, the pressure put on wrist may even give you effect. You can try with any low frequency piezo-ceramics with very good charge amplifiers and it may work.

Regards

Dr. Patel


 
 Reply 
 
puneet kumar audichya
puneet kumar audichya
02:19 Aug-25-2001
how vibration sensor using the fourier series is use in mechanical machines?
: Hi,

: I am a student undergoing a project ' in skf bearings india LTD.

: I am trying to capture wrist pulse in order to measure the heart rate.

: Here are few questions:
: 1. How to use a vibration sensor?

: 2. Is it it converts mechanical force into voltage directly? Then i capture the signal using an amplifier?


: Your help is much appreciated.

: actually i want to give the seminar in this topic so i do'nt know about more in vibration sensor plz help me as soon as possible?
: Thank you!




 
 Reply 
 

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