JPH0585020B2 - - Google Patents
Info
- Publication number
- JPH0585020B2 JPH0585020B2 JP7039389A JP7039389A JPH0585020B2 JP H0585020 B2 JPH0585020 B2 JP H0585020B2 JP 7039389 A JP7039389 A JP 7039389A JP 7039389 A JP7039389 A JP 7039389A JP H0585020 B2 JPH0585020 B2 JP H0585020B2
- Authority
- JP
- Japan
- Prior art keywords
- angle prism
- prism
- right angle
- prisms
- light
- 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.)
- Expired - Lifetime
Links
- 238000002798 spectrophotometry method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 238000002835 absorbance Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 17
- 230000003287 optical effect Effects 0.000 description 15
- 239000000243 solution Substances 0.000 description 10
- 239000000523 sample Substances 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 238000002834 transmittance Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 239000003365 glass fiber Substances 0.000 description 4
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 3
- 230000031700 light absorption Effects 0.000 description 3
- 238000005375 photometry Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- -1 iodine ions Chemical class 0.000 description 1
- 239000006193 liquid solution Substances 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、多重回反射光型吸光光度計に関す
る。更に詳しくは、液体中、気体中あるいは固体
中の極めて吸光度の小さい成分の透過率あるいは
吸光度を高倍率にして測定する多重回反射光型吸
光光度計に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a multi-reflection type absorption photometer. More specifically, the present invention relates to a multi-reflection spectrophotometer that measures the transmittance or absorbance of a component with extremely low absorbance in a liquid, gas, or solid at a high magnification.
〔従来技術〕
何らかの成分が分散した溶液の吸収スペクトル
を測定する際に、等しい厚さの純溶媒および溶液
に対する透過光の強さをそれぞれI0およびＩとす
れば、log10（I0／Ｉ）は、溶液の光吸収の強さを
表す量で、吸光度（または真吸光度）と呼ばれて
いる。[Prior art] When measuring the absorption spectrum of a solution in which some component is dispersed, if the intensities of transmitted light for pure solvent and solution of equal thickness are I 0 and I, respectively, then log 10 (I 0 /I ) is a quantity that represents the strength of light absorption of a solution, and is called absorbance (or true absorbance).
この吸光度に関しては、ランバート−ベールの
法則が有名である。この法則は、log10（I0／Ｉ）＝
εcd（εはモル吸光係数、ｃはモル濃度、ｄは吸
収層の厚さ）という関係が成立するものである。
吸光度を測定することによつて、モル吸光係数が
既知の物質の溶液中の濃度が求められる。したが
つて吸光度は、比色分析または紫外分光分析にお
いて重要な量である。 Regarding this absorbance, the Lambert-Beer law is famous. This law is log 10 (I 0 /I) =
The following relationship holds true: εcd (ε is the molar extinction coefficient, c is the molar concentration, and d is the thickness of the absorption layer).
By measuring absorbance, the concentration of a substance with a known molar extinction coefficient in a solution can be determined. Absorbance is therefore an important quantity in colorimetric or ultraviolet spectroscopy.
従来、ランバート−ベールの法則を使つた吸光
光度計では、吸光度の小さい溶液成分の透過率あ
るいは吸光度の測定法としては、サンプルの厚さ
ｄを厚くして光路長を大きくする方法が提案され
ている。しかしこの方法では、光路長に比例して
サンプル量が増加し、かつ装置も大型となつてし
まう。測定部の大きさは、光路の長いセルを必要
とし、例えば50mmあるいは100mmのサンプルが必
要である。 Conventionally, in spectrophotometers using Beer-Lambert's law, a method of increasing the optical path length by increasing the sample thickness d has been proposed as a method for measuring the transmittance or absorbance of solution components with low absorbance. There is. However, with this method, the amount of sample increases in proportion to the optical path length, and the apparatus also becomes larger. The size of the measuring section requires a cell with a long optical path, for example, a 50 mm or 100 mm sample.
したがつて、この方法は、標準長さ10mmの光路
長の場合と比較して、約５倍ないし10倍の吸光度
の値を得るのが最大であつた。また、長光路毛細
吸収管を用い、セルの光路長を延長することによ
り、吸光度を増加させた高感度吸光光度法も提案
されている。しかし、この方法では、特殊なセル
を使用するため、試料溶液の導入にポンプなどの
付帯設備を必要とする。更に、一部では、実験的
に中空ガラスフアイバーに液体サンプルを導入し
て、入射光源光をそのガラスフアイバーの内面で
全反射することにより通過させ、受光部の光電子
増倍管で検出する方法が試みられている。 Therefore, this method was maximally able to obtain absorbance values about 5 to 10 times that of the standard optical path length of 10 mm. A high-sensitivity spectrophotometric method has also been proposed in which the absorbance is increased by using a long optical path capillary absorption tube and extending the optical path length of the cell. However, since this method uses a special cell, it requires incidental equipment such as a pump to introduce the sample solution. Furthermore, in some experiments, a liquid sample is introduced into a hollow glass fiber, and the incident light source light is totally reflected on the inner surface of the glass fiber and then detected by a photomultiplier tube in the light receiving section. is being attempted.
この方法は、全反射させるためにサンプルの溶
媒の屈折率を中空ガラスフアイバーの屈折率より
大きくする必要がある。この方法は、例えば溶媒
として二硫化炭素を用いてよう素イオンの検出を
行つているが、一般的に使用することはできな
い。すなわち、一般的には、溶媒は水溶液を主体
として有機溶媒など広く用いられており、溶媒の
屈折率が、ガラスの屈折率より小さい場合が大半
である。また、中空ガラスフアイバーの内部に気
泡が導入されると測定の失敗の原因となる。 This method requires that the refractive index of the sample solvent be greater than the refractive index of the hollow glass fiber in order to cause total reflection. Although this method detects iodine ions using, for example, carbon disulfide as a solvent, it cannot be used generally. That is, in general, solvents are widely used, mainly aqueous solutions and organic solvents, and in most cases the refractive index of the solvent is smaller than the refractive index of glass. Furthermore, if air bubbles are introduced into the hollow glass fiber, it may cause measurement failure.
そこで、本発明者は、通常の光路長１cmの標準
セルを用いて、かつ吸光光度法の高感度化が達成
できる新たなる方法を考案し、その装置の原理を
報告した（日本分析化学会、49th、1B27
（1988））。光路長１cmの標準セルを用いて光路長
を延長するために、そこで第３図に示されるよう
に、対向した２個の直角プリズム３０，３０を用
いて入射光の多重回の反射により光路長を大幅に
延長できる方法を考案した。この方法をTwin
Prism Coupling（T.P.C）法と名付けた。 Therefore, the present inventor devised a new method that can achieve high sensitivity of spectrophotometry using a standard cell with an ordinary optical path length of 1 cm, and reported the principle of the device (Japan Society for Analytical Chemistry, 49th, 1B27
(1988)). In order to extend the optical path length using a standard cell with an optical path length of 1 cm, as shown in FIG. We have devised a method that can significantly extend the Twin this method
It was named the Prism Coupling (TPC) method.
この方式では、多重回の反射により光路長を極
端に長くすることができ、しかも一方の直角プリ
ズムの位置をずらすことにより、自由に光路長を
制御することができるという特長がある。 This method has the advantage that the optical path length can be made extremely long by multiple reflections, and that the optical path length can be freely controlled by shifting the position of one right-angle prism.
しかし、本出願人が提案した方法は、溶液成分
がきわめて少量または薄い成分の場合、前記方法
だけでは不充分であり、充分に吸光係数を測定で
きないことがある。
However, the method proposed by the present applicant is insufficient when the solution components are extremely small or dilute, and the extinction coefficient may not be measured satisfactorily.
この発明の目的は、吸光度の小さい成分を測定
するために、透過率あるいは吸光度を高倍率にし
て測定する多重回反射型吸光光度計測法を提供す
ることにある。 An object of the present invention is to provide a multi-reflection spectrophotometry method that measures transmittance or absorbance at high magnification in order to measure components with low absorbance.
この発明の他の目的は、光路長を小型の装置で
延長できる多重回反射型吸光光度計測法を提供す
ることにある。 Another object of the present invention is to provide a multi-reflection spectrophotometry method that allows the optical path length to be extended using a compact device.
この発明は、前記課題を解決するため次の手段
を採る。
This invention takes the following means to solve the above problems.
２個の直角プリズムを隣接させかつ並列して配
置し、前記２個の直角プリズムの斜面と対向し距
離をおいて、かつこの間に被測定物を配して前記
２個のプリズムと90度回転させた直角プリズムの
斜面とを配置し、前記２個の直角プリズムと前記
直角プリズム間を交互に多重回測定用の光を反射
させて前記被測定物を測定することを特徴とする
多重回反射光型吸光光度計である。 Two rectangular prisms are arranged adjacently and in parallel, and an object to be measured is placed between the two rectangular prisms, facing the slopes of the two rectangular prisms at a distance, and rotated by 90 degrees with respect to the two prisms. multiple reflection, characterized in that the object to be measured is measured by alternately reflecting the light for multiple measurements between the two right angle prisms and the right angle prism; It is a light absorption photometer.
望ましくは、前記２個の１つの直角プリズムの
直角部分を前記直角プリズムの斜面と平行に形成
したカツト面を有し、このカツト面から被測定物
を測定後の透過光を取り出すことを特徴とする多
重回反射光型吸光光度計測法が良い。 Preferably, the right angle portion of one of the two right angle prisms has a cut surface formed parallel to the slope of the right angle prism, and the transmitted light after measuring the object to be measured is extracted from the cut surface. A multi-reflection absorption photometry method is recommended.
この発明の原理
以下、この発明の原理を図面にしたがつて説明
する。第１図はこの発明の原理を示し、直角プリ
ズムの配置を示す略図である。直角プリズム１
は、三角形状の形をした透明体であり、光学ガラ
スでできたものである。直角プリズム１は、レー
ザ光を直角三角形の一辺である斜面４から入出力
する。この直角プリズム１とほぼ同じ形状の直角
プリズム５が平行に隣接して配置してある。直角
プリズム５の直角部分を有する頂点には、カツト
面９が形成してある。
Principle of this invention The principle of this invention will be explained below with reference to the drawings. FIG. 1 is a schematic diagram illustrating the principle of the invention and showing the arrangement of a right-angle prism. Right angle prism 1
is a triangular-shaped transparent body made of optical glass. The right-angle prism 1 inputs and outputs laser light from a slope 4 that is one side of a right-angled triangle. A right-angle prism 5 having substantially the same shape as the right-angle prism 1 is arranged adjacent to the right-angle prism 1 in parallel. A cut surface 9 is formed at the apex of the right angle prism 5 having a right angle portion.
カツト面９は、直角プリズム５の斜面８と平行
な面であり、鏡面仕上加工してある。このカツト
面９から後述するように測定後の透過光を取り出
す。直角プリズム５の斜面８は、直角プリズム１
と同様にレーザ光を入出力する面である。直角プ
リズム１の斜面４と直角プリズム５の斜面８との
面はほぼ同一平面になるように位置決めしてあ
る。ただし、斜面４と斜面８は原理的には同一平
面でなくても良く、互いに平行な面であれば良
い。 The cut surface 9 is a surface parallel to the slope 8 of the right angle prism 5, and is mirror finished. The transmitted light after measurement is taken out from this cut surface 9 as described later. The slope 8 of the right angle prism 5 is the same as the right angle prism 1.
Similarly, it is a surface that inputs and outputs laser light. The slopes 4 of the right-angle prism 1 and the slopes 8 of the right-angle prism 5 are positioned so that they are substantially on the same plane. However, in principle, the slope 4 and the slope 8 do not have to be on the same plane, but only need to be parallel to each other.
直角プリズム１と直角プリズム５とは、斜面
４，８と平行な平面内で、長さl1だけ位置がズレ
ている。一方、直角プリズム１，５と直角プリズ
ム１０との間の中央に、被測定物である試料が入
つたガラス容器で作られたセル２６（第２図）が
配置してある。直角プリズム１０の斜面１３は、
直角プリズム１，５の斜面４，８と対向して、か
つ角度90度に回転させて配置してある。 The positions of the right-angle prism 1 and the right-angle prism 5 are shifted by a length l 1 in a plane parallel to the slopes 4 and 8. On the other hand, in the center between the right-angle prisms 1 and 5 and the right-angle prism 10, a cell 26 (FIG. 2) made of a glass container containing a sample to be measured is arranged. The slope 13 of the right angle prism 10 is
It is arranged opposite to the slopes 4 and 8 of the right angle prisms 1 and 5 and rotated at an angle of 90 degrees.
計測装置
第２図は、前記原理に基づく多重回反射光型吸
光光度計測装置の概観を示す図である。平面の台
であるベース２０上に、レーザ発振器２１、プリ
ズムホルダ２２、セルホルダ２３、プリズムホル
ダ２４、光センサ２５の順に前記原理にしたがつ
て配置してある。レーザ発振器２１は、本例で
は、He−Neレーザの赤色光を発する発振器であ
る。Measuring Device FIG. 2 is a diagram showing an overview of a multi-reflection type absorbance photometry device based on the above-mentioned principle. A laser oscillator 21, a prism holder 22, a cell holder 23, a prism holder 24, and an optical sensor 25 are arranged in this order on a base 20, which is a flat table, in accordance with the above principle. In this example, the laser oscillator 21 is an oscillator that emits red light of a He-Ne laser.
プリズムホルダ２２は、第１図の直角プリズム
１、直角プリズム５を固定するホルダである。前
記した原理にしたがつて正確な位置、すなわち、
距離l1の位置ズレ、斜面４，８がほぼ同一平面に
なるように位置させるため位置決め固定機構など
を内蔵している（図示せず）。この固定機構は、
精密な位置決めに使われる差動ねじ機構であり、
位置決めに使われる周知の機構である。セルホル
ダ２３は、試料または標準試料を入れたガラス容
器のセル２６を保持するホルダである。通常、既
知の溶液をセルに入れて吸光度を測定後、未知の
溶液を同一セルに入れて吸光度を測定して比較す
る。 The prism holder 22 is a holder for fixing the right angle prism 1 and the right angle prism 5 shown in FIG. Accurate position according to the principles described above, i.e.
A positioning and fixing mechanism (not shown) is included in order to position the slopes 4 and 8 so that they are substantially flush with each other by a distance l1 . This fixing mechanism is
A differential screw mechanism used for precise positioning.
This is a well-known mechanism used for positioning. The cell holder 23 is a holder that holds a cell 26 of a glass container containing a sample or a standard sample. Usually, after a known solution is placed in a cell and the absorbance is measured, an unknown solution is placed in the same cell and the absorbance is measured and compared.
プリズムホルダ２４は、直角プリズム１０を収
容固定したものである。前記プリズムホルダ２２
と同様に位置決め固定機構（図示せず）を内蔵し
ている。直角プリズム５から透過光線が出るの
で、この透過光線を光センサ２５で受け止め電気
信号に変換して透過率とし、透過率を更に吸光度
に変換して被測定物の濃度、成分などを周知方法
で特定する。 The prism holder 24 accommodates and fixes the right angle prism 10. The prism holder 22
Similarly, it has a built-in positioning and fixing mechanism (not shown). A transmitted light beam is emitted from the rectangular prism 5, and this transmitted light beam is received by the optical sensor 25 and converted into an electric signal as transmittance.The transmittance is further converted into absorbance to determine the concentration, components, etc. of the object to be measured using a well-known method. Identify.
測定法
以下、この測定装置の動作の概要を示す。レー
ザ発振器２１はレーザ光を直角プリズム１の上方
（第２図では下方装置）より直角プリズム１０に
向けて出力する。本例のレーザ光は、He−Neレ
ーザの赤色光である。出力されたレーザ光ａは、
直角プリズム１０の斜面１３の面に垂直に入射す
る（以下、第１，２図参照）。直角プリズム１０
に入射した入射光線ａは、直角プリズム１０内で
全反射して180度向きを変えて、距離l2の位置に
射出光線ｂを出す。射出光線ｂは、直角プリズム
５の斜面８に入射する。入射したレーザ光は、直
角面６で全反射して、他方の直角面７に向かうレ
ーザ光線ｃとなり、再び全反射して直角プリズム
１０に向けて射出光線ｄとなる。Measuring method The operation of this measuring device will be outlined below. The laser oscillator 21 outputs laser light toward the right-angle prism 10 from above the right-angle prism 1 (lower device in FIG. 2). The laser light in this example is red light from a He-Ne laser. The output laser beam a is
The light is incident perpendicularly to the surface of the slope 13 of the right-angle prism 10 (see FIGS. 1 and 2 below). Right angle prism 10
The incident light ray a that has entered the rectangular prism 10 is totally reflected within the rectangular prism 10, changes its direction by 180 degrees, and emits an exit light ray b at a position at a distance l 2 . The emitted light beam b enters the slope 8 of the rectangular prism 5. The incident laser light is totally reflected by the right-angled surface 6 to become a laser beam c that heads toward the other right-angled surface 7, and is totally reflected again to become an emitted light beam d toward the right-angle prism 10.
直角プリズム１０は、再び直角面１１，１２
で、このレーザ光を全反射して射出光線ｅとな
る。この射出光線ｅは、距離l2量だけ直角プリズ
ム１側にシフトしているので、直角プリズム１の
斜面４側に入力する。直角プリズム１内入射した
光線は、直角面３、直角面２で全反射して再び直
角プリズム１０側に射出光線を出す。以下、同様
にレーザ光は、直角プリズム１、直角プリズム１
０、直角プリズム５、直角プリズム１０、直角プ
リズム１と往復を繰り返して、最後にカツト面９
から射出光線ｚを射出し、この透過光は光センサ
２５で受光される。この間、レーザ光は、セル２
６内の溶液を多重回透過し、吸光される。 The right angle prism 10 has right angle surfaces 11 and 12 again.
Then, this laser light is totally reflected and becomes an emitted light beam e. This emitted light ray e has been shifted toward the right-angle prism 1 by a distance l 2 , so it is input to the slope 4 side of the right-angle prism 1. The light beam entering the right angle prism 1 is totally reflected by the right angle surface 3 and the right angle surface 2, and outputs the light beam to the right angle prism 10 side again. Hereinafter, similarly, the laser beam is transmitted through right-angle prism 1, right-angle prism 1
0, right angle prism 5, right angle prism 10, right angle prism 1, and finally cut surface 9.
A light beam z is emitted from the light beam z, and this transmitted light is received by the optical sensor 25. During this time, the laser beam
The solution in 6 is passed through multiple times and the light is absorbed.
前記した実施例のレーザ発振器２１は、He−
Neレーザの赤色光であつた。しかし、緑色のHe
−Neレーザ、Dyeレーザなど被測定物の種類な
どに応じて他のレーザ発振器２１を用いて良いこ
とは前記説明から明白である。また、本例では、
レーザ光であるが、通常の可視光線、紫外線など
この分野で通常用いられるいかなる光線でも良
い。前記した実施例は、液体の溶液の例であつた
がこれに限定されるものではない。雲、霧、排
煙、NOxなどの気体、ガラス、プラスチツクな
どの固体にも適用できる。
The laser oscillator 21 of the embodiment described above is a He-
It was red light from a Ne laser. But the green He
It is clear from the above description that other laser oscillators 21 such as -Ne laser or Dye laser may be used depending on the type of the object to be measured. Also, in this example,
Although the laser beam is used, any light beam commonly used in this field, such as visible light or ultraviolet light, may be used. Although the above embodiments are examples of liquid solutions, the present invention is not limited thereto. It can also be applied to gases such as clouds, fog, flue gas, and NOx , as well as solids such as glass and plastics.
以上、詳記したようにこの発明の多重回反射光
型吸光光度計測法は、直角プリズムを３個配置す
るだけで従来に比して倍以上の高感度を得ること
ができるので、濃度の薄い溶液、きわめて少量の
被測定溶液でも測定が可能になつた。
As described in detail above, the multiple reflected light absorption photometry method of the present invention can obtain high sensitivity more than twice that of the conventional method by simply arranging three right-angle prisms. It has become possible to measure even a very small amount of solution.
第１図はこの発明の原理を示す直角プリズムの
配置を示す図、第２図は多重回反射光型吸光光度
計測定装置の概観を示す図、第３図は従来技術を
示す図である。
１，５，１０…直角プリズム、２，３，６，
７，１１，１２…直角面、４，８，１３…斜面。
FIG. 1 is a diagram showing the arrangement of a rectangular prism illustrating the principle of the present invention, FIG. 2 is a diagram showing an overview of a multi-reflection type absorption photometer measuring device, and FIG. 3 is a diagram showing a prior art. 1, 5, 10...Right angle prism, 2, 3, 6,
7, 11, 12... right angle surface, 4, 8, 13... slope.
Claims (1)
配置し、前記２個の直角プリズムの斜面と対向し
距離をおいて、かつこの間に被測定物を配して前
記２個のプリズムと90度回転させた直角プリズム
の斜面とを配置し、前記２個の直角プリズムと前
記直角プリズム間を交互に多重回測定用の光を反
射させて前記被測定物を測定することを特徴とす
る多重回反射光型吸光光度計。 ２ 請求項１において、前記２個の１つの直角プ
リズムの直角部分を前記直角プリズムの斜面と平
行に形成したカツト面を有し、このカツト面から
被測定物を測定後の透過光を取り出すことを特徴
とする多重回反射光型吸光光度計測法。[Scope of Claims] 1. Two rectangular prisms are arranged adjacently and in parallel, and an object to be measured is disposed between the slopes of the two rectangular prisms, facing the slopes of the two rectangular prisms at a distance. arranging two prisms and a slope of a right-angle prism rotated by 90 degrees, and measuring the object by alternately reflecting light for multiple measurements between the two right-angle prisms and the right-angle prism. A multi-reflection spectrophotometer featuring: 2. According to claim 1, the right angle portion of the two right angle prisms has a cut surface formed parallel to the slope of the right angle prism, and the transmitted light after measuring the object to be measured is extracted from the cut surface. A multi-reflection spectrophotometry method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7039389A JPH02249955A (en) | 1989-03-24 | 1989-03-24 | Multiple times reflected light type absorptiometry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7039389A JPH02249955A (en) | 1989-03-24 | 1989-03-24 | Multiple times reflected light type absorptiometry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02249955A JPH02249955A (en) | 1990-10-05 |
| JPH0585020B2 true JPH0585020B2 (en) | 1993-12-06 |
Family
ID=13430159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7039389A Granted JPH02249955A (en) | 1989-03-24 | 1989-03-24 | Multiple times reflected light type absorptiometry |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02249955A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05157694A (en) * | 1991-12-10 | 1993-06-25 | Kajima Corp | Transparency monitor |
| WO2001048456A1 (en) * | 1999-12-29 | 2001-07-05 | Environmental Systems Products, Inc. | System and method for remote analysis of small engine vehicle emissions |
| JP6084399B2 (en) * | 2012-08-20 | 2017-02-22 | 株式会社四国総合研究所 | Optical gas sensor and gas concentration monitoring method |
| JP6263411B2 (en) * | 2014-02-20 | 2018-01-17 | 株式会社四国総合研究所 | Optical sensor chip |
| CN104076420B (en) * | 2014-06-20 | 2017-06-06 | 浙江卷积科技有限公司 | Convex surface prism and the laser reflection device based on convex surface prism |
| EP3719556A1 (en) * | 2019-04-05 | 2020-10-07 | Optos PLC | Optical system, optical delay line and oct apparatus |
-
1989
- 1989-03-24 JP JP7039389A patent/JPH02249955A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02249955A (en) | 1990-10-05 |
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