GB2194339A - A data recording depth gauge - Google Patents
A data recording depth gauge Download PDFInfo
- Publication number
- GB2194339A GB2194339A GB08620581A GB8620581A GB2194339A GB 2194339 A GB2194339 A GB 2194339A GB 08620581 A GB08620581 A GB 08620581A GB 8620581 A GB8620581 A GB 8620581A GB 2194339 A GB2194339 A GB 2194339A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bung
- film
- tube
- light
- depth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 230000001419 dependent effect Effects 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 241000272496 Galliformes Species 0.000 claims description 2
- 241001465754 Metazoa Species 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- 230000003760 hair shine Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 229920003217 poly(methylsilsesquioxane) Polymers 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims description 2
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
- G01F23/16—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/16—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of pistons
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A depth gauge consists of an air filled tube containing a piston on which is mounted a light source which irradiates adjacent photographic film. A depth increases as the piston is forced inwards against air pressure. Piston position, which indicates depth, is determined by the position of exposures on the film and the time spent at each depth is determined by the optical density of the film at specific positions.
Description
SPECIFICATION
A depth gauge
DESIGN AND PRINCIPLE OF OPERATION
The depth gauge consists of a translucent tube, closed at one end and sealed at the other except for a small snorkel. Within the tube, at the snorkel end, is housed a bung which fits-perfectly within the cylinder so that an air-tight seal exists between the cylinder walls and the bung. Attached to the bung is a light source (eg. a light emitting diode) which is powered by batteries and encapsulated in a clear waterproof matrix, such as fibre-glass resin. The main tube body is made to be light tight except for a clear window running longitudinally up the length of the tube. The encapsulated light emitting diode is orientated on the bung so that it shines out of this window.
Photographic film, placed in a heat-sealed polythene sachet is placed over the window and fixed in position so that the only light falling on the film is the light from the light emitting diode. When this device is lowered in the water column the increase in water pressure causes water to enter the tube via the snorkel (light cannot enter the tube due to the shape of the snorkel). The bung moves towards the closed end of the tube as the volume of air in the tube decreases until the air pressure exactly counteracts the water pressure. The position of the bung within the tube is determined by water pressure, which is determined by depth. When the device is brought to the surface the process is reversed and the bung moves back to its original position at the snorkel end of the tube.Light from the light emitting diode falls on adjacent film and thus, changes in bung position (and hence changes in depth) can be detected when the film is developed. Furthermore, the optical density of the blackening produced on the film is a function of exposure time. After suitable calibration, this device will, therefore, indicate the length of time that it has spent at any particular depth.
GENERAL SPECIFICATIONS
The tube body may be any size. In general, larger tubes, with larger volumes of air encapsulated, produce a finer response to changes in depth. Typically the tube would have an internal air volume between one and 50 cm3.
A modified medical syringe provides an ideal tube-bung system that is made to exacting standards and yet is small with little mass.
Plastic syringes can be sealed by being melted at their needle end and can be made lightproof by being covered with eg. heat-shrink tubing (although a window must be cut to allow the light emitting diode to expose the film). With such a syringe-based system, a back plate must be added to exclude light.
The back plate can be made of black plastic and can be wired or screwed in place. A hole in the back-plate allows the insertion of the snorkel. The snorkel is a piece of tubing (with an internal diameter generally between 0.5 mm and 5 mm) that is twisted along its length before it enters the hole in the back plate. Thus water can enter the device but light is excluded. The diameter of the tubing used for the snorkel is dependent on the size of the device. Larger devices require tubing with larger diameters if the bung is to respond quickly to changes in depth.
The light emitting diode unit consists of a battery (or batteries), a light emitting diode and a resistor. The light emitting diode is placed in series with the resistor and the battery (or batteries). The brightness of the diode is dependent on the voltage of the battery (or batteries) and the value of the resistor (which is placed in the circuit to limit the current). In general, for applications which require the device to record long periods at different depths, the value of the resistor will be high so that the diode emits relatively little light and the film will respond relatively slowly.
The choice of film is important when considering the length of time over which the device is to record. Dull light emitting diodes can record relatively short events if a fast film (high ASA) is used. The film is sealed in a water-tight sachet. If one side of the sachet is made from clear (or translucent) polythene and the other side is made from black polythene it is easier to exclude light when the film is is place. The film can be easily held in place by water-proof tape for example.
The construction of the gauge confers a number of advantages over conventional gauges: low weight and volume, low battery drain and cheap starting materials. These features make the gauge particularly useful as a disposable transducer for monitoring the behaviour of living creatures, e.g. birds at sea, when recovery of the transducer is uncertain.
Suitable harness can be devised to ensure that the transducer does not impede the movement of the animal.
1. A data recording depth gauge compris ing a variable body of air whereby changes in the air volume (such as occurs with changing pressure corresponding to differential water depths) are accompanied by movement of a boundry bung.
2. A data recording depth gauge as claimed in Claim 1 whereby bung position indicates water depth.
3. A data recording depth gauge as claimed in Claim 1 or Claim 2 whereby a light source affixed to the boundary bung exposes adjacent photographic film so that bung position can be subsequently determined.
4. A data recording depth gauge as claimed in any preceding claim wherein the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A data recording depth gauge compris ing a variable body of air whereby changes in the air volume (such as occurs with changing pressure corresponding to differential water depths) are accompanied by movement of a boundry bung.
2. A data recording depth gauge as claimed in Claim 1 whereby bung position indicates water depth.
3. A data recording depth gauge as claimed in Claim 1 or Claim 2 whereby a light source affixed to the boundary bung exposes adjacent photographic film so that bung position can be subsequently determined.
4. A data recording depth gauge as claimed in any preceding claim wherein the light source exposes adjacent photographic film so that exposure time at various bung positions can be subsequently determined.
5. A data recording depth gauge substantially as described herein with reference to Fig.
1 of the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08620581A GB2194339A (en) | 1986-08-23 | 1986-08-23 | A data recording depth gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08620581A GB2194339A (en) | 1986-08-23 | 1986-08-23 | A data recording depth gauge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8620581D0 GB8620581D0 (en) | 1986-10-01 |
| GB2194339A true GB2194339A (en) | 1988-03-02 |
Family
ID=10603197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08620581A Withdrawn GB2194339A (en) | 1986-08-23 | 1986-08-23 | A data recording depth gauge |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2194339A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672179A (en) * | 2019-09-27 | 2020-01-10 | 珠海格力智能装备有限公司 | Boiler liquid level detection method and device, storage medium and control equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1330285A (en) * | 1970-02-17 | 1973-09-12 | Morski Inst Rybacki | Method of measuring and registering the depth of underwater elements of a trawl set and apparatus for using the method |
| GB1515091A (en) * | 1975-01-17 | 1978-06-21 | Alinari C | Instrument for indicating the depths and durations of decompression stops required during underwater submersions |
| GB2050607A (en) * | 1979-06-01 | 1981-01-07 | British Gas Corp | Peak Pressure Indicator |
-
1986
- 1986-08-23 GB GB08620581A patent/GB2194339A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1330285A (en) * | 1970-02-17 | 1973-09-12 | Morski Inst Rybacki | Method of measuring and registering the depth of underwater elements of a trawl set and apparatus for using the method |
| GB1515091A (en) * | 1975-01-17 | 1978-06-21 | Alinari C | Instrument for indicating the depths and durations of decompression stops required during underwater submersions |
| GB2050607A (en) * | 1979-06-01 | 1981-01-07 | British Gas Corp | Peak Pressure Indicator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672179A (en) * | 2019-09-27 | 2020-01-10 | 珠海格力智能装备有限公司 | Boiler liquid level detection method and device, storage medium and control equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8620581D0 (en) | 1986-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |