Questions tagged [calibration]

Questions related to measuring a device's frequency-response and sensitivity.

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Hydrophone calibration in a tank vs open water?

I’m looking to calibrate some hydrophones (specifically SoundTrap 300HFs, but perhaps this applies more broadly). I’m aiming to compare the SoundTrap hydrophone with a reference one, roughly following ...
TPW's user avatar
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3 votes
1 answer
41 views

How to adjust seewave spectro to account for hydrophone sensitivity?

I am using seewave's spectro() to generate a spectrogram from a hydrophone recording. My call is: ...
Tom Quigley's user avatar
5 votes
0 answers
57 views

How to apply calibration infromation to Triton generated LTSAs

Is it possible to apply single end-to-end calibration values or a transfer function to LTSA plots generated in Triton? The User Guide says that transfer functions are not applied to LTSAs but that a ...
DeniseR's user avatar
  • 550
12 votes
2 answers
119 views

How long do hydrophone (/microphone) calibrations last for?

A colleague asked the room this the other day and nobody could confidently answer this... How long, after an acoustic sensor has been calibrated, is its calibration curve trustworthy for? There was ...
Chloe's user avatar
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6 votes
1 answer
55 views

Recommendations for deep sea hydrophone calibration - US West Coast

I would like recommendations of where to get 7 deep-sea hydrophones fully calibrated. Units are SonoValuts (purchased new from Develogic) and the hydrophones are Neptune D/60. Recorders were ...
John Bleach's user avatar
7 votes
1 answer
102 views

Calibrate automatic recorders: advice for reliable / reproducible workflow?

I would like to get the ambient noise levels of a habitat that I have been monitoring for some time (monitoring birds, 0-16 kHz). For this, I want to calibrate my recorders and get their sensitivity ...
lframond's user avatar
  • 1,024
8 votes
2 answers
190 views

Best practice for measuring amplitude of biophony

It is often useful to quantitatively measure (or at least estimate) the amplitude of an acoustic event such as a bird song. The desired measurement could be, for instance, that a bird sang at 105 dB ...
Sam Lapp's user avatar
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7 votes
1 answer
65 views

How can you incorporate the hydrophone calibration in Avisoft?

I am stuck in being able to calibrate the avisoft. I have a soundtrap Hf300 and I'm not sure how to insert the data into the avisoft calibration. Any advice? Thanks All the best
Gisela Giardino's user avatar
6 votes
1 answer
92 views

Low cost hydrophones for quantitative sound pressure measurements?

Has anyone experience with using low-cost hydrophones, for example the Acquarian Audio H2a, and use a calibration measurements, for example by comparing to a Brüel Kjaer 8106, to get quantitative ...
Jörg Rychen's user avatar
15 votes
3 answers
100 views

How to evaluate changing sensitivity of a recorder over time?

In discussions with colleagues I've learned that the sensitivity of a recorder can vary over the duration of a deployment. I'm not sure why or how this happens, but how can you evaluate if it has ...
ASimonis's user avatar
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19 votes
2 answers
151 views

SoundTrap calibration at high frequencies

SoundTraps, like all high frequency recorders, are highly unlikely to have a flat frequency response. Although there is some calibration information at 250 Hz from the manufacturer this will not ...
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4 votes
1 answer
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Implementing reciprocity calibrations inhouse?

Inspired by this question I began to wonder how implementable an inhouse reciprocity calibration would be. In reciprocal calibration, 2 or 3 mics are used as sound sources and as recovers to quantify ...
Thejasvi's user avatar
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11 votes
1 answer
69 views

Can someone recommend hardware to generate ultrasound on underwater recording rig?

I would like to construct a simple system for automatic playback of ultrasound signals at low levels for calibration purposes on an underwater recording rig. Can anyone point to a suitable DAC (...
user avatar
14 votes
1 answer
220 views

How to correctly input SoundTraps calibration data in PAMGuard for accurate noise measurements?

I am working with data from 3 different HF500 SoundTraps. To compare noise levels across stations, I would like to calibrate the measurements using the calibration values provided by the manufacturer. ...
Morgane's user avatar
  • 457
12 votes
2 answers
74 views

Permits for projecting sounds underwater?

I was recently scheduled to do some fieldwork in Canada, and this started with a calibration of our recording equipment. The calibration entailed projecting simulated clicks (from 10-150 kHz) to our ...
Chloe's user avatar
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7 votes
3 answers
61 views

leaving mics in a cave during fieldwork

I'm recording bats in a cave with many small (Knowles SPU-0410), and big (Sanken CO-100) mics. The cave is mostly isolated from the outside, with a temperature between 10-15C inside, and it could get ...
Thejasvi's user avatar
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11 votes
2 answers
80 views

How do animals gauge the distance of a sound source?

I'm wondering if there are any common principles for how animals gauge the distance of a sound source. How to differentiate between a close, soft sound and a loud distant sound? For example, ...
BirdGuyWes's user avatar
11 votes
3 answers
74 views

Microphone calibration stability?

I've always wondered how 'stable' microphone frequency response and sensitivities are? In particular, I'm not talking about the high-end (GRAS/B&K/others) calibration microphones, but rather '...
Thejasvi's user avatar
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17 votes
5 answers
301 views

Calibrated vs. Non-calibrated Hydrophone Use

I am interested in collecting underwater acoustic data from a small boat and am finding the cost difference to be quite significant between calibrated and non-calibrated hydrophones. What are the ...
LizFerg's user avatar
  • 1,147
12 votes
1 answer
88 views

Software packages to run microphone frequency-response calibrations?

I will need to measure microphone frequency responses in the coming weeks. In the past I have always used scripts I wrote or written by colleagues. They seemed to work, but required tweaking each time ...
Thejasvi's user avatar
  • 4,070
16 votes
8 answers
183 views

How to start exploring possibilities of using smartphones as recording devices?

I am thinking about starting to explore use of smartphones (Android, iOS) for in-field sound recording for amateur citizen-science. I was not able to find technical information about existing projects....
pabouk - Ukraine stay strong's user avatar
10 votes
3 answers
74 views

Distinguishing between types of recorder calibration

I have come across many terms to describe different types of recorder calibrations (e.g., end-to-end calibration, point calibration, factory calibration) and the whole topic of recorder calibration ...
Audrey Looby's user avatar
19 votes
3 answers
301 views

Calibrate an AudioMoth automated sound recorder

Has anyone shared their calibration of an AudioMoth automated sound recorder that has become popular as an inexpensive passive monitoring device with open-source firmware? The manual specifications of ...
Chiricahua herpetologist's user avatar